Precalculus Examples

$x^{2} + 6 x + y^{2} - 4 y = - 4$ , $4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1

Solve for $x$ in $x^{2} + 6 x + y^{2} - 4 y = - 4$ .

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Step 1.1

Add $4$ to both sides of the equation.

$x^{2} + 6 x + y^{2} - 4 y + 4 = 0$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.2

Use the quadratic formula to find the solutions.

$\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.3

Substitute the values $a = 1$ , $b = 6$ , and $c = y^{2} - 4 y + 4$ into the quadratic formula and solve for $x$ .

$\frac{- 6 \pm \sqrt{6^{2} - 4 \cdot (1 \cdot (y^{2} - 4 y + 4))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4

Simplify.

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Step 1.4.1

Simplify the numerator.

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Step 1.4.1.1

Rewrite $4 \cdot 1 \cdot (y^{2} - 4 y + 4)$ as ${(2 \cdot 1 \cdot (y - 2))}^{2}$ .

$x = \frac{- 6 \pm \sqrt{6^{2} - {(2 \cdot 1 \cdot (y - 2))}^{2}}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 6$ and $b = 2 \cdot 1 \cdot (y - 2)$ .

$x = \frac{- 6 \pm \sqrt{(6 + 2 \cdot 1 \cdot (y - 2)) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.3

Simplify.

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Step 1.4.1.3.1

Multiply $2$ by $1$ .

$x = \frac{- 6 \pm \sqrt{(6 + 2 \cdot (y - 2)) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.3.2

Apply the distributive property.

$x = \frac{- 6 \pm \sqrt{(6 + 2 y + 2 \cdot - 2) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.3.3

Multiply $2$ by $- 2$ .

$x = \frac{- 6 \pm \sqrt{(6 + 2 y - 4) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.3.4

Subtract $4$ from $6$ .

$x = \frac{- 6 \pm \sqrt{(2 y + 2) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.3.5

Factor $2$ out of $2 y + 2$ .

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Step 1.4.1.3.5.1

Factor $2$ out of $2 y$ .

$x = \frac{- 6 \pm \sqrt{(2 (y) + 2) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.3.5.2

Factor $2$ out of $2$ .

$x = \frac{- 6 \pm \sqrt{(2 (y) + 2 (1)) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.3.5.3

Factor $2$ out of $2 (y) + 2 (1)$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.3.6

Combine exponents.

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Step 1.4.1.3.6.1

Multiply $2$ by $1$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - (2 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.3.6.2

Multiply $2$ by $- 1$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 (y - 2))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 (y - 2))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 (y - 2))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.4

Simplify each term.

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Step 1.4.1.4.1

Apply the distributive property.

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 y - 2 \cdot - 2)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.4.2

Multiply $- 2$ by $- 2$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 y + 4)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 y + 4)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.5

Add $6$ and $4$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (- 2 y + 10)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.6

Factor $2$ out of $- 2 y + 10$ .

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Step 1.4.1.6.1

Factor $2$ out of $- 2 y$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (2 (- y) + 10)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.6.2

Factor $2$ out of $10$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (2 (- y) + 2 (5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.6.3

Factor $2$ out of $2 (- y) + 2 (5)$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (2 (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) \cdot (2 (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.7

Multiply $2$ by $2$ .

$x = \frac{- 6 \pm \sqrt{4 (y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.8

Rewrite $4 (y + 1) (- y + 5)$ as $2^{2} ((y + 1^{2}) (- y + 5))$ .

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Step 1.4.1.8.1

Rewrite $4$ as $2^{2}$ .

$x = \frac{- 6 \pm \sqrt{2^{2} (y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.8.2

Rewrite $1$ as $1^{2}$ .

$x = \frac{- 6 \pm \sqrt{2^{2} (y + 1^{2}) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.8.3

Add parentheses.

$x = \frac{- 6 \pm \sqrt{2^{2} ((y + 1^{2}) (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2^{2} ((y + 1^{2}) (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.9

Pull terms out from under the radical.

$x = \frac{- 6 \pm 2 \sqrt{(y + 1^{2}) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.1.10

One to any power is one.

$x = \frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.2

Multiply $2$ by $1$ .

$x = \frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.4.3

Simplify $\frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2}$ .

$x = - 3 \pm \sqrt{(y + 1) (- y + 5)}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = - 3 \pm \sqrt{(y + 1) (- y + 5)}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5

Simplify the expression to solve for the $+$ portion of the $\pm$ .

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Step 1.5.1

Simplify the numerator.

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Step 1.5.1.1

Rewrite $4 \cdot 1 \cdot (y^{2} - 4 y + 4)$ as ${(2 \cdot 1 \cdot (y - 2))}^{2}$ .

$x = \frac{- 6 \pm \sqrt{6^{2} - {(2 \cdot 1 \cdot (y - 2))}^{2}}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 6$ and $b = 2 \cdot 1 \cdot (y - 2)$ .

$x = \frac{- 6 \pm \sqrt{(6 + 2 \cdot 1 \cdot (y - 2)) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.3

Simplify.

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Step 1.5.1.3.1

Multiply $2$ by $1$ .

$x = \frac{- 6 \pm \sqrt{(6 + 2 \cdot (y - 2)) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.3.2

Apply the distributive property.

$x = \frac{- 6 \pm \sqrt{(6 + 2 y + 2 \cdot - 2) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.3.3

Multiply $2$ by $- 2$ .

$x = \frac{- 6 \pm \sqrt{(6 + 2 y - 4) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.3.4

Subtract $4$ from $6$ .

$x = \frac{- 6 \pm \sqrt{(2 y + 2) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.3.5

Factor $2$ out of $2 y + 2$ .

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Step 1.5.1.3.5.1

Factor $2$ out of $2 y$ .

$x = \frac{- 6 \pm \sqrt{(2 (y) + 2) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.3.5.2

Factor $2$ out of $2$ .

$x = \frac{- 6 \pm \sqrt{(2 (y) + 2 (1)) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.3.5.3

Factor $2$ out of $2 (y) + 2 (1)$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.3.6

Combine exponents.

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Step 1.5.1.3.6.1

Multiply $2$ by $1$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - (2 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.3.6.2

Multiply $2$ by $- 1$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 (y - 2))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 (y - 2))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 (y - 2))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.4

Simplify each term.

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Step 1.5.1.4.1

Apply the distributive property.

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 y - 2 \cdot - 2)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.4.2

Multiply $- 2$ by $- 2$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 y + 4)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 y + 4)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.5

Add $6$ and $4$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (- 2 y + 10)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.6

Factor $2$ out of $- 2 y + 10$ .

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Step 1.5.1.6.1

Factor $2$ out of $- 2 y$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (2 (- y) + 10)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.6.2

Factor $2$ out of $10$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (2 (- y) + 2 (5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.6.3

Factor $2$ out of $2 (- y) + 2 (5)$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (2 (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) \cdot (2 (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.7

Multiply $2$ by $2$ .

$x = \frac{- 6 \pm \sqrt{4 (y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.8

Rewrite $4 (y + 1) (- y + 5)$ as $2^{2} ((y + 1^{2}) (- y + 5))$ .

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Step 1.5.1.8.1

Rewrite $4$ as $2^{2}$ .

$x = \frac{- 6 \pm \sqrt{2^{2} (y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.8.2

Rewrite $1$ as $1^{2}$ .

$x = \frac{- 6 \pm \sqrt{2^{2} (y + 1^{2}) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.8.3

Add parentheses.

$x = \frac{- 6 \pm \sqrt{2^{2} ((y + 1^{2}) (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2^{2} ((y + 1^{2}) (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.9

Pull terms out from under the radical.

$x = \frac{- 6 \pm 2 \sqrt{(y + 1^{2}) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.1.10

One to any power is one.

$x = \frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.2

Multiply $2$ by $1$ .

$x = \frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.3

Simplify $\frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2}$ .

$x = - 3 \pm \sqrt{(y + 1) (- y + 5)}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.5.4

Change the $\pm$ to $+$ .

$x = - 3 + \sqrt{(y + 1) (- y + 5)}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = - 3 + \sqrt{(y + 1) (- y + 5)}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6

Simplify the expression to solve for the $-$ portion of the $\pm$ .

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Step 1.6.1

Simplify the numerator.

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Step 1.6.1.1

Rewrite $4 \cdot 1 \cdot (y^{2} - 4 y + 4)$ as ${(2 \cdot 1 \cdot (y - 2))}^{2}$ .

$x = \frac{- 6 \pm \sqrt{6^{2} - {(2 \cdot 1 \cdot (y - 2))}^{2}}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 6$ and $b = 2 \cdot 1 \cdot (y - 2)$ .

$x = \frac{- 6 \pm \sqrt{(6 + 2 \cdot 1 \cdot (y - 2)) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.3

Simplify.

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Step 1.6.1.3.1

Multiply $2$ by $1$ .

$x = \frac{- 6 \pm \sqrt{(6 + 2 \cdot (y - 2)) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.3.2

Apply the distributive property.

$x = \frac{- 6 \pm \sqrt{(6 + 2 y + 2 \cdot - 2) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.3.3

Multiply $2$ by $- 2$ .

$x = \frac{- 6 \pm \sqrt{(6 + 2 y - 4) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.3.4

Subtract $4$ from $6$ .

$x = \frac{- 6 \pm \sqrt{(2 y + 2) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.3.5

Factor $2$ out of $2 y + 2$ .

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Step 1.6.1.3.5.1

Factor $2$ out of $2 y$ .

$x = \frac{- 6 \pm \sqrt{(2 (y) + 2) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.3.5.2

Factor $2$ out of $2$ .

$x = \frac{- 6 \pm \sqrt{(2 (y) + 2 (1)) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.3.5.3

Factor $2$ out of $2 (y) + 2 (1)$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - (2 \cdot 1 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.3.6

Combine exponents.

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Step 1.6.1.3.6.1

Multiply $2$ by $1$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - (2 \cdot (y - 2)))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.3.6.2

Multiply $2$ by $- 1$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 (y - 2))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 (y - 2))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 (y - 2))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.4

Simplify each term.

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Step 1.6.1.4.1

Apply the distributive property.

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 y - 2 \cdot - 2)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.4.2

Multiply $- 2$ by $- 2$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 y + 4)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (6 - 2 y + 4)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.5

Add $6$ and $4$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (- 2 y + 10)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.6

Factor $2$ out of $- 2 y + 10$ .

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Step 1.6.1.6.1

Factor $2$ out of $- 2 y$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (2 (- y) + 10)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.6.2

Factor $2$ out of $10$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (2 (- y) + 2 (5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.6.3

Factor $2$ out of $2 (- y) + 2 (5)$ .

$x = \frac{- 6 \pm \sqrt{2 (y + 1) (2 (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2 (y + 1) \cdot (2 (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.7

Multiply $2$ by $2$ .

$x = \frac{- 6 \pm \sqrt{4 (y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.8

Rewrite $4 (y + 1) (- y + 5)$ as $2^{2} ((y + 1^{2}) (- y + 5))$ .

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Step 1.6.1.8.1

Rewrite $4$ as $2^{2}$ .

$x = \frac{- 6 \pm \sqrt{2^{2} (y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.8.2

Rewrite $1$ as $1^{2}$ .

$x = \frac{- 6 \pm \sqrt{2^{2} (y + 1^{2}) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.8.3

Add parentheses.

$x = \frac{- 6 \pm \sqrt{2^{2} ((y + 1^{2}) (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm \sqrt{2^{2} ((y + 1^{2}) (- y + 5))}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.9

Pull terms out from under the radical.

$x = \frac{- 6 \pm 2 \sqrt{(y + 1^{2}) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.1.10

One to any power is one.

$x = \frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = \frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2 \cdot 1}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.2

Multiply $2$ by $1$ .

$x = \frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.3

Simplify $\frac{- 6 \pm 2 \sqrt{(y + 1) (- y + 5)}}{2}$ .

$x = - 3 \pm \sqrt{(y + 1) (- y + 5)}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.6.4

Change the $\pm$ to $-$ .

$x = - 3 - \sqrt{(y + 1) (- y + 5)}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = - 3 - \sqrt{(y + 1) (- y + 5)}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 1.7

The final answer is the combination of both solutions.

$x = - 3 + \sqrt{(y + 1) (- y + 5)}$

$x = - 3 - \sqrt{(y + 1) (- y + 5)}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

$x = - 3 + \sqrt{(y + 1) (- y + 5)}$

$x = - 3 - \sqrt{(y + 1) (- y + 5)}$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 2

Solve the system $x = - 3 + \sqrt{(y + 1) (- y + 5)}, 4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$ .

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Step 2.1

Reorder $- 3$ and $\sqrt{(y + 1) (- y + 5)}$ .

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 2.2

Replace all occurrences of $x$ with $\sqrt{(y + 1) (- y + 5)} - 3$ in each equation.

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Step 2.2.1

Replace all occurrences of $x$ in $4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$ with $\sqrt{(y + 1) (- y + 5)} - 3$ .

$4 {(\sqrt{(y + 1) (- y + 5)} - 3)}^{2} + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2

Simplify the left side.

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Step 2.2.2.1

Simplify $4 {(\sqrt{(y + 1) (- y + 5)} - 3)}^{2} + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y$ .

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Step 2.2.2.1.1

Simplify each term.

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Step 2.2.2.1.1.1

Rewrite ${(\sqrt{(y + 1) (- y + 5)} - 3)}^{2}$ as $(\sqrt{(y + 1) (- y + 5)} - 3) (\sqrt{(y + 1) (- y + 5)} - 3)$ .

$4 ((\sqrt{(y + 1) (- y + 5)} - 3) (\sqrt{(y + 1) (- y + 5)} - 3)) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.2

Expand $(\sqrt{(y + 1) (- y + 5)} - 3) (\sqrt{(y + 1) (- y + 5)} - 3)$ using the FOIL Method.

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Step 2.2.2.1.1.2.1

Apply the distributive property.

$4 (\sqrt{(y + 1) (- y + 5)} (\sqrt{(y + 1) (- y + 5)} - 3) - 3 (\sqrt{(y + 1) (- y + 5)} - 3)) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.2.2

Apply the distributive property.

$4 (\sqrt{(y + 1) (- y + 5)} \sqrt{(y + 1) (- y + 5)} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (\sqrt{(y + 1) (- y + 5)} - 3)) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.2.3

Apply the distributive property.

$4 (\sqrt{(y + 1) (- y + 5)} \sqrt{(y + 1) (- y + 5)} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$4 (\sqrt{(y + 1) (- y + 5)} \sqrt{(y + 1) (- y + 5)} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3

Simplify and combine like terms.

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Step 2.2.2.1.1.3.1

Simplify each term.

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Step 2.2.2.1.1.3.1.1

Multiply $\sqrt{(y + 1) (- y + 5)} \sqrt{(y + 1) (- y + 5)}$ .

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Step 2.2.2.1.1.3.1.1.1

Raise $\sqrt{(y + 1) (- y + 5)}$ to the power of $1$ .

$4 (\sqrt{(y + 1) (- y + 5)} \sqrt{(y + 1) (- y + 5)} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.1.2

Raise $\sqrt{(y + 1) (- y + 5)}$ to the power of $1$ .

$4 (\sqrt{(y + 1) (- y + 5)} \sqrt{(y + 1) (- y + 5)} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.1.3

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$4 ({\sqrt{(y + 1) (- y + 5)}}^{1 + 1} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.1.4

Add $1$ and $1$ .

$4 ({\sqrt{(y + 1) (- y + 5)}}^{2} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$4 ({\sqrt{(y + 1) (- y + 5)}}^{2} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.2

Rewrite ${\sqrt{(y + 1) (- y + 5)}}^{2}$ as $(y + 1) (- y + 5)$ .

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Step 2.2.2.1.1.3.1.2.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{(y + 1) (- y + 5)}$ as ${((y + 1) (- y + 5))}^{\frac{1}{2}}$ .

$4 ({({((y + 1) (- y + 5))}^{\frac{1}{2}})}^{2} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.2.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$4 ({((y + 1) (- y + 5))}^{\frac{1}{2} \cdot 2} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.2.3

Combine $\frac{1}{2}$ and $2$ .

$4 ({((y + 1) (- y + 5))}^{\frac{2}{2}} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.2.4

Cancel the common factor of $2$ .

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Step 2.2.2.1.1.3.1.2.4.1

Cancel the common factor.

$4 ({((y + 1) (- y + 5))}^{\frac{2}{2}} + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.2.4.2

Rewrite the expression.

$4 (((y + 1) (- y + 5)) + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$4 (((y + 1) (- y + 5)) + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.2.5

Simplify.

$4 ((y + 1) (- y + 5) + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$4 ((y + 1) (- y + 5) + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.3

Expand $(y + 1) (- y + 5)$ using the FOIL Method.

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Step 2.2.2.1.1.3.1.3.1

Apply the distributive property.

$4 (y (- y + 5) + 1 (- y + 5) + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.3.2

Apply the distributive property.

$4 (y (- y) + y \cdot 5 + 1 (- y + 5) + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.3.3

Apply the distributive property.

$4 (y (- y) + y \cdot 5 + 1 (- y) + 1 \cdot 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$4 (y (- y) + y \cdot 5 + 1 (- y) + 1 \cdot 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.4

Simplify and combine like terms.

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Step 2.2.2.1.1.3.1.4.1

Simplify each term.

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Step 2.2.2.1.1.3.1.4.1.1

Rewrite using the commutative property of multiplication.

$4 (- y \cdot y + y \cdot 5 + 1 (- y) + 1 \cdot 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.4.1.2

Multiply $y$ by $y$ by adding the exponents.

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Step 2.2.2.1.1.3.1.4.1.2.1

Move $y$ .

$4 (- (y \cdot y) + y \cdot 5 + 1 (- y) + 1 \cdot 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.4.1.2.2

Multiply $y$ by $y$ .

$4 (- y^{2} + y \cdot 5 + 1 (- y) + 1 \cdot 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$4 (- y^{2} + y \cdot 5 + 1 (- y) + 1 \cdot 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.4.1.3

Move $5$ to the left of $y$ .

$4 (- y^{2} + 5 \cdot y + 1 (- y) + 1 \cdot 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.4.1.4

Multiply $- y$ by $1$ .

$4 (- y^{2} + 5 y - y + 1 \cdot 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.4.1.5

Multiply $5$ by $1$ .

$4 (- y^{2} + 5 y - y + 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$4 (- y^{2} + 5 y - y + 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.4.2

Subtract $y$ from $5 y$ .

$4 (- y^{2} + 4 y + 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$4 (- y^{2} + 4 y + 5 + \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.5

Move $- 3$ to the left of $\sqrt{(y + 1) (- y + 5)}$ .

$4 (- y^{2} + 4 y + 5 - 3 \cdot \sqrt{(y + 1) (- y + 5)} - 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.1.6

Multiply $- 3$ by $- 3$ .

$4 (- y^{2} + 4 y + 5 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \sqrt{(y + 1) (- y + 5)} + 9) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$4 (- y^{2} + 4 y + 5 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \sqrt{(y + 1) (- y + 5)} + 9) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.2

Add $5$ and $9$ .

$4 (- y^{2} + 4 y + 14 - 3 \sqrt{(y + 1) (- y + 5)} - 3 \sqrt{(y + 1) (- y + 5)}) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.3.3

Subtract $3 \sqrt{(y + 1) (- y + 5)}$ from $- 3 \sqrt{(y + 1) (- y + 5)}$ .

$4 (- y^{2} + 4 y + 14 - 6 \sqrt{(y + 1) (- y + 5)}) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$4 (- y^{2} + 4 y + 14 - 6 \sqrt{(y + 1) (- y + 5)}) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.4

Apply the distributive property.

$4 (- y^{2}) + 4 (4 y) + 4 \cdot 14 + 4 (- 6 \sqrt{(y + 1) (- y + 5)}) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.5

Simplify.

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Step 2.2.2.1.1.5.1

Multiply $- 1$ by $4$ .

$- 4 y^{2} + 4 (4 y) + 4 \cdot 14 + 4 (- 6 \sqrt{(y + 1) (- y + 5)}) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.5.2

Multiply $4$ by $4$ .

$- 4 y^{2} + 16 y + 4 \cdot 14 + 4 (- 6 \sqrt{(y + 1) (- y + 5)}) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.5.3

Multiply $4$ by $14$ .

$- 4 y^{2} + 16 y + 56 + 4 (- 6 \sqrt{(y + 1) (- y + 5)}) + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.5.4

Multiply $- 6$ by $4$ .

$- 4 y^{2} + 16 y + 56 - 24 \sqrt{(y + 1) (- y + 5)} + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$- 4 y^{2} + 16 y + 56 - 24 \sqrt{(y + 1) (- y + 5)} + 24 (\sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.6

Apply the distributive property.

$- 4 y^{2} + 16 y + 56 - 24 \sqrt{(y + 1) (- y + 5)} + 24 \sqrt{(y + 1) (- y + 5)} + 24 \cdot - 3 + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.1.7

Multiply $24$ by $- 3$ .

$- 4 y^{2} + 16 y + 56 - 24 \sqrt{(y + 1) (- y + 5)} + 24 \sqrt{(y + 1) (- y + 5)} - 72 + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$- 4 y^{2} + 16 y + 56 - 24 \sqrt{(y + 1) (- y + 5)} + 24 \sqrt{(y + 1) (- y + 5)} - 72 + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.2

Simplify by adding terms.

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Step 2.2.2.1.2.1

Combine the opposite terms in $- 4 y^{2} + 16 y + 56 - 24 \sqrt{(y + 1) (- y + 5)} + 24 \sqrt{(y + 1) (- y + 5)} - 72 + 25 y^{2} - 50 y$ .

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Step 2.2.2.1.2.1.1

Add $- 24 \sqrt{(y + 1) (- y + 5)}$ and $24 \sqrt{(y + 1) (- y + 5)}$ .

$- 4 y^{2} + 16 y + 56 + 0 - 72 + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.2.1.2

Add $- 4 y^{2} + 16 y + 56$ and $0$ .

$- 4 y^{2} + 16 y + 56 - 72 + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$- 4 y^{2} + 16 y + 56 - 72 + 25 y^{2} - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.2.2

Add $- 4 y^{2}$ and $25 y^{2}$ .

$21 y^{2} + 16 y + 56 - 72 - 50 y = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.2.3

Subtract $50 y$ from $16 y$ .

$21 y^{2} - 34 y + 56 - 72 = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.2.2.1.2.4

Subtract $72$ from $56$ .

$21 y^{2} - 34 y - 16 = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$21 y^{2} - 34 y - 16 = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$21 y^{2} - 34 y - 16 = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$21 y^{2} - 34 y - 16 = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$21 y^{2} - 34 y - 16 = 39$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3

Solve for $y$ in $21 y^{2} - 34 y - 16 = 39$ .

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Step 2.3.1

Subtract $39$ from both sides of the equation.

$21 y^{2} - 34 y - 16 - 39 = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.2

Subtract $39$ from $- 16$ .

$21 y^{2} - 34 y - 55 = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.3

Factor by grouping.

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Step 2.3.3.1

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = 21 \cdot - 55 = - 1155$ and whose sum is $b = - 34$ .

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Step 2.3.3.1.1

Factor $- 34$ out of $- 34 y$ .

$21 y^{2} - 34 y - 55 = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.3.1.2

Rewrite $- 34$ as $21$ plus $- 55$

$21 y^{2} + (21 - 55) y - 55 = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.3.1.3

Apply the distributive property.

$21 y^{2} + 21 y - 55 y - 55 = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$21 y^{2} + 21 y - 55 y - 55 = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.3.2

Factor out the greatest common factor from each group.

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Step 2.3.3.2.1

Group the first two terms and the last two terms.

$(21 y^{2} + 21 y) - 55 y - 55 = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.3.2.2

Factor out the greatest common factor (GCF) from each group.

$21 y (y + 1) - 55 (y + 1) = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$21 y (y + 1) - 55 (y + 1) = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.3.3

Factor the polynomial by factoring out the greatest common factor, $y + 1$ .

$(y + 1) (21 y - 55) = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$(y + 1) (21 y - 55) = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.4

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$y + 1 = 0$

$21 y - 55 = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.5

Set $y + 1$ equal to $0$ and solve for $y$ .

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Step 2.3.5.1

Set $y + 1$ equal to $0$ .

$y + 1 = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.5.2

Subtract $1$ from both sides of the equation.

$y = - 1$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$y = - 1$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.6

Set $21 y - 55$ equal to $0$ and solve for $y$ .

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Step 2.3.6.1

Set $21 y - 55$ equal to $0$ .

$21 y - 55 = 0$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.6.2

Solve $21 y - 55 = 0$ for $y$ .

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Step 2.3.6.2.1

Add $55$ to both sides of the equation.

$21 y = 55$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.6.2.2

Divide each term in $21 y = 55$ by $21$ and simplify.

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Step 2.3.6.2.2.1

Divide each term in $21 y = 55$ by $21$ .

$\frac{21 y}{21} = \frac{55}{21}$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.6.2.2.2

Simplify the left side.

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Step 2.3.6.2.2.2.1

Cancel the common factor of $21$ .

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Step 2.3.6.2.2.2.1.1

Cancel the common factor.

$\frac{21 y}{21} = \frac{55}{21}$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.6.2.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{55}{21}$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$y = \frac{55}{21}$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$y = \frac{55}{21}$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$y = \frac{55}{21}$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$y = \frac{55}{21}$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$y = \frac{55}{21}$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.3.7

The final solution is all the values that make $(y + 1) (21 y - 55) = 0$ true.

$y = - 1, \frac{55}{21}$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

$y = - 1, \frac{55}{21}$

$x = \sqrt{(y + 1) (- y + 5)} - 3$

Step 2.4

Replace all occurrences of $y$ with $- 1$ in each equation.

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Step 2.4.1

Replace all occurrences of $y$ in $x = \sqrt{(y + 1) (- y + 5)} - 3$ with $- 1$ .

$x = \sqrt{((- 1) + 1) (- (- 1) + 5)} - 3$

$y = - 1$

Step 2.4.2

Simplify the right side.

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Step 2.4.2.1

Simplify $\sqrt{((- 1) + 1) (- (- 1) + 5)} - 3$ .

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Step 2.4.2.1.1

Simplify each term.

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Step 2.4.2.1.1.1

Add $- 1$ and $1$ .

$x = \sqrt{0 (- (- 1) + 5)} - 3$

$y = - 1$

Step 2.4.2.1.1.2

Multiply $- 1$ by $- 1$ .

$x = \sqrt{0 (1 + 5)} - 3$

$y = - 1$

Step 2.4.2.1.1.3

Add $1$ and $5$ .

$x = \sqrt{0 \cdot 6} - 3$

$y = - 1$

Step 2.4.2.1.1.4

Multiply $0$ by $6$ .

$x = \sqrt{0} - 3$

$y = - 1$

Step 2.4.2.1.1.5

Rewrite $0$ as $0^{2}$ .

$x = \sqrt{0^{2}} - 3$

$y = - 1$

Step 2.4.2.1.1.6

Pull terms out from under the radical, assuming positive real numbers.

$x = 0 - 3$

$y = - 1$

$x = 0 - 3$

$y = - 1$

Step 2.4.2.1.2

Subtract $3$ from $0$ .

$x = - 3$

$y = - 1$

$x = - 3$

$y = - 1$

$x = - 3$

$y = - 1$

$x = - 3$

$y = - 1$

Step 2.5

Replace all occurrences of $y$ with $\frac{55}{21}$ in each equation.

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Step 2.5.1

Replace all occurrences of $y$ in $x = \sqrt{(y + 1) (- y + 5)} - 3$ with $\frac{55}{21}$ .

$x = \sqrt{((\frac{55}{21}) + 1) (- (\frac{55}{21}) + 5)} - 3$

$y = \frac{55}{21}$

Step 2.5.2

Simplify the right side.

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Step 2.5.2.1

Simplify each term.

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Step 2.5.2.1.1

Write $1$ as a fraction with a common denominator.

$x = \sqrt{(\frac{55}{21} + \frac{21}{21}) (- \frac{55}{21} + 5)} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.2

Combine the numerators over the common denominator.

$x = \sqrt{\frac{55 + 21}{21} \cdot (- \frac{55}{21} + 5)} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.3

Add $55$ and $21$ .

$x = \sqrt{\frac{76}{21} \cdot (- \frac{55}{21} + 5)} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.4

To write $5$ as a fraction with a common denominator, multiply by $\frac{21}{21}$ .

$x = \sqrt{\frac{76}{21} \cdot (- \frac{55}{21} + 5 \cdot \frac{21}{21})} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.5

Combine $5$ and $\frac{21}{21}$ .

$x = \sqrt{\frac{76}{21} \cdot (- \frac{55}{21} + \frac{5 \cdot 21}{21})} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.6

Combine the numerators over the common denominator.

$x = \sqrt{\frac{76}{21} \cdot \frac{- 55 + 5 \cdot 21}{21}} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.7

Simplify the numerator.

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Step 2.5.2.1.7.1

Multiply $5$ by $21$ .

$x = \sqrt{\frac{76}{21} \cdot \frac{- 55 + 105}{21}} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.7.2

Add $- 55$ and $105$ .

$x = \sqrt{\frac{76}{21} \cdot \frac{50}{21}} - 3$

$y = \frac{55}{21}$

$x = \sqrt{\frac{76}{21} \cdot \frac{50}{21}} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.8

Multiply $\frac{76}{21}$ by $\frac{50}{21}$ .

$x = \sqrt{\frac{76 \cdot 50}{21 \cdot 21}} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.9

Multiply $76$ by $50$ .

$x = \sqrt{\frac{3800}{21 \cdot 21}} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.10

Multiply $21$ by $21$ .

$x = \sqrt{\frac{3800}{441}} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.11

Rewrite $\sqrt{\frac{3800}{441}}$ as $\frac{\sqrt{3800}}{\sqrt{441}}$ .

$x = \frac{\sqrt{3800}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.12

Simplify the numerator.

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Step 2.5.2.1.12.1

Rewrite $3800$ as $10^{2} \cdot 38$ .

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Step 2.5.2.1.12.1.1

Factor $100$ out of $3800$ .

$x = \frac{\sqrt{100 (38)}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.12.1.2

Rewrite $100$ as $10^{2}$ .

$x = \frac{\sqrt{10^{2} \cdot 38}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

$x = \frac{\sqrt{10^{2} \cdot 38}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.12.2

Pull terms out from under the radical.

$x = \frac{10 \sqrt{38}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

$x = \frac{10 \sqrt{38}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.13

Simplify the denominator.

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Step 2.5.2.1.13.1

Rewrite $441$ as $21^{2}$ .

$x = \frac{10 \sqrt{38}}{\sqrt{21^{2}}} - 3$

$y = \frac{55}{21}$

Step 2.5.2.1.13.2

Pull terms out from under the radical, assuming positive real numbers.

$x = \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

$x = \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

$x = \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

$x = \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

$x = \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

$x = \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

Step 3

Solve the system $x = - 3 - \sqrt{(y + 1) (- y + 5)}, 4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$ .

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Step 3.1

Reorder $- 3$ and $- \sqrt{(y + 1) (- y + 5)}$ .

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$

Step 3.2

Replace all occurrences of $x$ with $- \sqrt{(y + 1) (- y + 5)} - 3$ in each equation.

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Step 3.2.1

Replace all occurrences of $x$ in $4 x^{2} + 24 x + 25 y^{2} - 50 y = 39$ with $- \sqrt{(y + 1) (- y + 5)} - 3$ .

$4 {(- \sqrt{(y + 1) (- y + 5)} - 3)}^{2} + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Simplify $4 {(- \sqrt{(y + 1) (- y + 5)} - 3)}^{2} + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y$ .

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Step 3.2.2.1.1

Simplify each term.

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Step 3.2.2.1.1.1

Rewrite ${(- \sqrt{(y + 1) (- y + 5)} - 3)}^{2}$ as $(- \sqrt{(y + 1) (- y + 5)} - 3) (- \sqrt{(y + 1) (- y + 5)} - 3)$ .

$4 ((- \sqrt{(y + 1) (- y + 5)} - 3) (- \sqrt{(y + 1) (- y + 5)} - 3)) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.2

Expand $(- \sqrt{(y + 1) (- y + 5)} - 3) (- \sqrt{(y + 1) (- y + 5)} - 3)$ using the FOIL Method.

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Step 3.2.2.1.1.2.1

Apply the distributive property.

$4 (- \sqrt{(y + 1) (- y + 5)} (- \sqrt{(y + 1) (- y + 5)} - 3) - 3 (- \sqrt{(y + 1) (- y + 5)} - 3)) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.2.2

Apply the distributive property.

$4 (- \sqrt{(y + 1) (- y + 5)} (- \sqrt{(y + 1) (- y + 5)}) - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)} - 3)) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.2.3

Apply the distributive property.

$4 (- \sqrt{(y + 1) (- y + 5)} (- \sqrt{(y + 1) (- y + 5)}) - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3

Simplify and combine like terms.

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Step 3.2.2.1.1.3.1

Simplify each term.

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Step 3.2.2.1.1.3.1.1

Multiply $- \sqrt{(y + 1) (- y + 5)} (- \sqrt{(y + 1) (- y + 5)})$ .

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Step 3.2.2.1.1.3.1.1.1

Multiply $- 1$ by $- 1$ .

$4 (1 \sqrt{(y + 1) (- y + 5)} \sqrt{(y + 1) (- y + 5)} - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.1.2

Multiply $\sqrt{(y + 1) (- y + 5)}$ by $1$ .

$4 (\sqrt{(y + 1) (- y + 5)} \sqrt{(y + 1) (- y + 5)} - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.1.3

Raise $\sqrt{(y + 1) (- y + 5)}$ to the power of $1$ .

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.1.4

Raise $\sqrt{(y + 1) (- y + 5)}$ to the power of $1$ .

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.1.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$4 ({\sqrt{(y + 1) (- y + 5)}}^{1 + 1} - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.1.6

Add $1$ and $1$ .

$4 ({\sqrt{(y + 1) (- y + 5)}}^{2} - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$4 ({\sqrt{(y + 1) (- y + 5)}}^{2} - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.2

Rewrite ${\sqrt{(y + 1) (- y + 5)}}^{2}$ as $(y + 1) (- y + 5)$ .

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Step 3.2.2.1.1.3.1.2.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{(y + 1) (- y + 5)}$ as ${((y + 1) (- y + 5))}^{\frac{1}{2}}$ .

$4 ({({((y + 1) (- y + 5))}^{\frac{1}{2}})}^{2} - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.2.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$4 ({((y + 1) (- y + 5))}^{\frac{1}{2} \cdot 2} - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.2.3

Combine $\frac{1}{2}$ and $2$ .

$4 ({((y + 1) (- y + 5))}^{\frac{2}{2}} - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.2.4

Cancel the common factor of $2$ .

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Step 3.2.2.1.1.3.1.2.4.1

Cancel the common factor.

$4 ({((y + 1) (- y + 5))}^{\frac{2}{2}} - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.2.4.2

Rewrite the expression.

$4 (((y + 1) (- y + 5)) - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$4 (((y + 1) (- y + 5)) - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.2.5

Simplify.

$4 ((y + 1) (- y + 5) - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$4 ((y + 1) (- y + 5) - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.3

Expand $(y + 1) (- y + 5)$ using the FOIL Method.

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Step 3.2.2.1.1.3.1.3.1

Apply the distributive property.

$4 (y (- y + 5) + 1 (- y + 5) - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.3.2

Apply the distributive property.

$4 (y (- y) + y \cdot 5 + 1 (- y + 5) - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.3.3

Apply the distributive property.

$4 (y (- y) + y \cdot 5 + 1 (- y) + 1 \cdot 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$4 (y (- y) + y \cdot 5 + 1 (- y) + 1 \cdot 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.4

Simplify and combine like terms.

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Step 3.2.2.1.1.3.1.4.1

Simplify each term.

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Step 3.2.2.1.1.3.1.4.1.1

Rewrite using the commutative property of multiplication.

$4 (- y \cdot y + y \cdot 5 + 1 (- y) + 1 \cdot 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.4.1.2

Multiply $y$ by $y$ by adding the exponents.

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Step 3.2.2.1.1.3.1.4.1.2.1

Move $y$ .

$4 (- (y \cdot y) + y \cdot 5 + 1 (- y) + 1 \cdot 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.4.1.2.2

Multiply $y$ by $y$ .

$4 (- y^{2} + y \cdot 5 + 1 (- y) + 1 \cdot 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$4 (- y^{2} + y \cdot 5 + 1 (- y) + 1 \cdot 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.4.1.3

Move $5$ to the left of $y$ .

$4 (- y^{2} + 5 \cdot y + 1 (- y) + 1 \cdot 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.4.1.4

Multiply $- y$ by $1$ .

$4 (- y^{2} + 5 y - y + 1 \cdot 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.4.1.5

Multiply $5$ by $1$ .

$4 (- y^{2} + 5 y - y + 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$4 (- y^{2} + 5 y - y + 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.4.2

Subtract $y$ from $5 y$ .

$4 (- y^{2} + 4 y + 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$4 (- y^{2} + 4 y + 5 - \sqrt{(y + 1) (- y + 5)} \cdot - 3 - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.5

Multiply $- 3$ by $- 1$ .

$4 (- y^{2} + 4 y + 5 + 3 \sqrt{(y + 1) (- y + 5)} - 3 (- \sqrt{(y + 1) (- y + 5)}) - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.6

Multiply $- 1$ by $- 3$ .

$4 (- y^{2} + 4 y + 5 + 3 \sqrt{(y + 1) (- y + 5)} + 3 \sqrt{(y + 1) (- y + 5)} - 3 \cdot - 3) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.1.7

Multiply $- 3$ by $- 3$ .

$4 (- y^{2} + 4 y + 5 + 3 \sqrt{(y + 1) (- y + 5)} + 3 \sqrt{(y + 1) (- y + 5)} + 9) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$4 (- y^{2} + 4 y + 5 + 3 \sqrt{(y + 1) (- y + 5)} + 3 \sqrt{(y + 1) (- y + 5)} + 9) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.2

Add $5$ and $9$ .

$4 (- y^{2} + 4 y + 14 + 3 \sqrt{(y + 1) (- y + 5)} + 3 \sqrt{(y + 1) (- y + 5)}) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.3.3

Add $3 \sqrt{(y + 1) (- y + 5)}$ and $3 \sqrt{(y + 1) (- y + 5)}$ .

$4 (- y^{2} + 4 y + 14 + 6 \sqrt{(y + 1) (- y + 5)}) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$4 (- y^{2} + 4 y + 14 + 6 \sqrt{(y + 1) (- y + 5)}) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.4

Apply the distributive property.

$4 (- y^{2}) + 4 (4 y) + 4 \cdot 14 + 4 (6 \sqrt{(y + 1) (- y + 5)}) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.5

Simplify.

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Step 3.2.2.1.1.5.1

Multiply $- 1$ by $4$ .

$- 4 y^{2} + 4 (4 y) + 4 \cdot 14 + 4 (6 \sqrt{(y + 1) (- y + 5)}) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.5.2

Multiply $4$ by $4$ .

$- 4 y^{2} + 16 y + 4 \cdot 14 + 4 (6 \sqrt{(y + 1) (- y + 5)}) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.5.3

Multiply $4$ by $14$ .

$- 4 y^{2} + 16 y + 56 + 4 (6 \sqrt{(y + 1) (- y + 5)}) + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.5.4

Multiply $6$ by $4$ .

$- 4 y^{2} + 16 y + 56 + 24 \sqrt{(y + 1) (- y + 5)} + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$- 4 y^{2} + 16 y + 56 + 24 \sqrt{(y + 1) (- y + 5)} + 24 (- \sqrt{(y + 1) (- y + 5)} - 3) + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.6

Apply the distributive property.

$- 4 y^{2} + 16 y + 56 + 24 \sqrt{(y + 1) (- y + 5)} + 24 (- \sqrt{(y + 1) (- y + 5)}) + 24 \cdot - 3 + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.7

Multiply $- 1$ by $24$ .

$- 4 y^{2} + 16 y + 56 + 24 \sqrt{(y + 1) (- y + 5)} - 24 \sqrt{(y + 1) (- y + 5)} + 24 \cdot - 3 + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.1.8

Multiply $24$ by $- 3$ .

$- 4 y^{2} + 16 y + 56 + 24 \sqrt{(y + 1) (- y + 5)} - 24 \sqrt{(y + 1) (- y + 5)} - 72 + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$- 4 y^{2} + 16 y + 56 + 24 \sqrt{(y + 1) (- y + 5)} - 24 \sqrt{(y + 1) (- y + 5)} - 72 + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.2

Simplify by adding terms.

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Step 3.2.2.1.2.1

Combine the opposite terms in $- 4 y^{2} + 16 y + 56 + 24 \sqrt{(y + 1) (- y + 5)} - 24 \sqrt{(y + 1) (- y + 5)} - 72 + 25 y^{2} - 50 y$ .

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Step 3.2.2.1.2.1.1

Subtract $24 \sqrt{(y + 1) (- y + 5)}$ from $24 \sqrt{(y + 1) (- y + 5)}$ .

$- 4 y^{2} + 16 y + 56 + 0 - 72 + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.2.1.2

Add $- 4 y^{2} + 16 y + 56$ and $0$ .

$- 4 y^{2} + 16 y + 56 - 72 + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$- 4 y^{2} + 16 y + 56 - 72 + 25 y^{2} - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.2.2

Add $- 4 y^{2}$ and $25 y^{2}$ .

$21 y^{2} + 16 y + 56 - 72 - 50 y = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.2.3

Subtract $50 y$ from $16 y$ .

$21 y^{2} - 34 y + 56 - 72 = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.2.2.1.2.4

Subtract $72$ from $56$ .

$21 y^{2} - 34 y - 16 = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$21 y^{2} - 34 y - 16 = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$21 y^{2} - 34 y - 16 = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$21 y^{2} - 34 y - 16 = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$21 y^{2} - 34 y - 16 = 39$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3

Solve for $y$ in $21 y^{2} - 34 y - 16 = 39$ .

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Step 3.3.1

Subtract $39$ from both sides of the equation.

$21 y^{2} - 34 y - 16 - 39 = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.2

Subtract $39$ from $- 16$ .

$21 y^{2} - 34 y - 55 = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.3

Factor by grouping.

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Step 3.3.3.1

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = 21 \cdot - 55 = - 1155$ and whose sum is $b = - 34$ .

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Step 3.3.3.1.1

Factor $- 34$ out of $- 34 y$ .

$21 y^{2} - 34 y - 55 = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.3.1.2

Rewrite $- 34$ as $21$ plus $- 55$

$21 y^{2} + (21 - 55) y - 55 = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.3.1.3

Apply the distributive property.

$21 y^{2} + 21 y - 55 y - 55 = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$21 y^{2} + 21 y - 55 y - 55 = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.3.2

Factor out the greatest common factor from each group.

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Step 3.3.3.2.1

Group the first two terms and the last two terms.

$(21 y^{2} + 21 y) - 55 y - 55 = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.3.2.2

Factor out the greatest common factor (GCF) from each group.

$21 y (y + 1) - 55 (y + 1) = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$21 y (y + 1) - 55 (y + 1) = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.3.3

Factor the polynomial by factoring out the greatest common factor, $y + 1$ .

$(y + 1) (21 y - 55) = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$(y + 1) (21 y - 55) = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.4

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$y + 1 = 0$

$21 y - 55 = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.5

Set $y + 1$ equal to $0$ and solve for $y$ .

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Step 3.3.5.1

Set $y + 1$ equal to $0$ .

$y + 1 = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.5.2

Subtract $1$ from both sides of the equation.

$y = - 1$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$y = - 1$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.6

Set $21 y - 55$ equal to $0$ and solve for $y$ .

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Step 3.3.6.1

Set $21 y - 55$ equal to $0$ .

$21 y - 55 = 0$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.6.2

Solve $21 y - 55 = 0$ for $y$ .

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Step 3.3.6.2.1

Add $55$ to both sides of the equation.

$21 y = 55$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.6.2.2

Divide each term in $21 y = 55$ by $21$ and simplify.

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Step 3.3.6.2.2.1

Divide each term in $21 y = 55$ by $21$ .

$\frac{21 y}{21} = \frac{55}{21}$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.6.2.2.2

Simplify the left side.

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Step 3.3.6.2.2.2.1

Cancel the common factor of $21$ .

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Step 3.3.6.2.2.2.1.1

Cancel the common factor.

$\frac{21 y}{21} = \frac{55}{21}$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.6.2.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{55}{21}$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$y = \frac{55}{21}$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$y = \frac{55}{21}$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$y = \frac{55}{21}$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$y = \frac{55}{21}$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$y = \frac{55}{21}$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.3.7

The final solution is all the values that make $(y + 1) (21 y - 55) = 0$ true.

$y = - 1, \frac{55}{21}$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

$y = - 1, \frac{55}{21}$

$x = - \sqrt{(y + 1) (- y + 5)} - 3$

Step 3.4

Replace all occurrences of $y$ with $- 1$ in each equation.

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Step 3.4.1

Replace all occurrences of $y$ in $x = - \sqrt{(y + 1) (- y + 5)} - 3$ with $- 1$ .

$x = - \sqrt{((- 1) + 1) (- (- 1) + 5)} - 3$

$y = - 1$

Step 3.4.2

Simplify the right side.

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Step 3.4.2.1

Simplify $- \sqrt{((- 1) + 1) (- (- 1) + 5)} - 3$ .

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Step 3.4.2.1.1

Simplify each term.

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Step 3.4.2.1.1.1

Add $- 1$ and $1$ .

$x = - \sqrt{0 (- (- 1) + 5)} - 3$

$y = - 1$

Step 3.4.2.1.1.2

Multiply $- 1$ by $- 1$ .

$x = - \sqrt{0 (1 + 5)} - 3$

$y = - 1$

Step 3.4.2.1.1.3

Add $1$ and $5$ .

$x = - \sqrt{0 \cdot 6} - 3$

$y = - 1$

Step 3.4.2.1.1.4

Multiply $0$ by $6$ .

$x = - \sqrt{0} - 3$

$y = - 1$

Step 3.4.2.1.1.5

Rewrite $0$ as $0^{2}$ .

$x = - \sqrt{0^{2}} - 3$

$y = - 1$

Step 3.4.2.1.1.6

Pull terms out from under the radical, assuming positive real numbers.

$x = - 0 - 3$

$y = - 1$

Step 3.4.2.1.1.7

Multiply $- 1$ by $0$ .

$x = 0 - 3$

$y = - 1$

$x = 0 - 3$

$y = - 1$

Step 3.4.2.1.2

Subtract $3$ from $0$ .

$x = - 3$

$y = - 1$

$x = - 3$

$y = - 1$

$x = - 3$

$y = - 1$

$x = - 3$

$y = - 1$

Step 3.5

Replace all occurrences of $y$ with $\frac{55}{21}$ in each equation.

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Step 3.5.1

Replace all occurrences of $y$ in $x = - \sqrt{(y + 1) (- y + 5)} - 3$ with $\frac{55}{21}$ .

$x = - \sqrt{((\frac{55}{21}) + 1) (- (\frac{55}{21}) + 5)} - 3$

$y = \frac{55}{21}$

Step 3.5.2

Simplify the right side.

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Step 3.5.2.1

Simplify each term.

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Step 3.5.2.1.1

Write $1$ as a fraction with a common denominator.

$x = - \sqrt{(\frac{55}{21} + \frac{21}{21}) (- \frac{55}{21} + 5)} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.2

Combine the numerators over the common denominator.

$x = - \sqrt{\frac{55 + 21}{21} \cdot (- \frac{55}{21} + 5)} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.3

Add $55$ and $21$ .

$x = - \sqrt{\frac{76}{21} \cdot (- \frac{55}{21} + 5)} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.4

To write $5$ as a fraction with a common denominator, multiply by $\frac{21}{21}$ .

$x = - \sqrt{\frac{76}{21} \cdot (- \frac{55}{21} + 5 \cdot \frac{21}{21})} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.5

Combine $5$ and $\frac{21}{21}$ .

$x = - \sqrt{\frac{76}{21} \cdot (- \frac{55}{21} + \frac{5 \cdot 21}{21})} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.6

Combine the numerators over the common denominator.

$x = - \sqrt{\frac{76}{21} \cdot \frac{- 55 + 5 \cdot 21}{21}} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.7

Simplify the numerator.

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Step 3.5.2.1.7.1

Multiply $5$ by $21$ .

$x = - \sqrt{\frac{76}{21} \cdot \frac{- 55 + 105}{21}} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.7.2

Add $- 55$ and $105$ .

$x = - \sqrt{\frac{76}{21} \cdot \frac{50}{21}} - 3$

$y = \frac{55}{21}$

$x = - \sqrt{\frac{76}{21} \cdot \frac{50}{21}} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.8

Multiply $\frac{76}{21}$ by $\frac{50}{21}$ .

$x = - \sqrt{\frac{76 \cdot 50}{21 \cdot 21}} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.9

Multiply $76$ by $50$ .

$x = - \sqrt{\frac{3800}{21 \cdot 21}} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.10

Multiply $21$ by $21$ .

$x = - \sqrt{\frac{3800}{441}} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.11

Rewrite $\sqrt{\frac{3800}{441}}$ as $\frac{\sqrt{3800}}{\sqrt{441}}$ .

$x = - \frac{\sqrt{3800}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.12

Simplify the numerator.

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Step 3.5.2.1.12.1

Rewrite $3800$ as $10^{2} \cdot 38$ .

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Step 3.5.2.1.12.1.1

Factor $100$ out of $3800$ .

$x = - \frac{\sqrt{100 (38)}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.12.1.2

Rewrite $100$ as $10^{2}$ .

$x = - \frac{\sqrt{10^{2} \cdot 38}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

$x = - \frac{\sqrt{10^{2} \cdot 38}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.12.2

Pull terms out from under the radical.

$x = - \frac{10 \sqrt{38}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

$x = - \frac{10 \sqrt{38}}{\sqrt{441}} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.13

Simplify the denominator.

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Step 3.5.2.1.13.1

Rewrite $441$ as $21^{2}$ .

$x = - \frac{10 \sqrt{38}}{\sqrt{21^{2}}} - 3$

$y = \frac{55}{21}$

Step 3.5.2.1.13.2

Pull terms out from under the radical, assuming positive real numbers.

$x = - \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

$x = - \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

$x = - \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

$x = - \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

$x = - \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

$x = - \frac{10 \sqrt{38}}{21} - 3$

$y = \frac{55}{21}$

Step 4

The solution to the system is the complete set of ordered pairs that are valid solutions.

$(- 3, - 1)$

$(\frac{10 \sqrt{38}}{21} - 3, \frac{55}{21})$

$(- \frac{10 \sqrt{38}}{21} - 3, \frac{55}{21})$

Step 5

The result can be shown in multiple forms.

Point Form:

$(- 3, - 1), (\frac{10 \sqrt{38}}{21} - 3, \frac{55}{21}), (- \frac{10 \sqrt{38}}{21} - 3, \frac{55}{21})$

Equation Form:

$x = - 3, y = - 1$

$x = \frac{10 \sqrt{38}}{21} - 3, y = \frac{55}{21}$

$x = - \frac{10 \sqrt{38}}{21} - 3, y = \frac{55}{21}$

Step 6