Pre-Algebra Examples

$81 x^{2} + 81 y^{2} - 126 x + 126 y \cdot y = 98$

Step 1

Simplify $81 x^{2} + 81 y^{2} - 126 x + 126 y \cdot y$ .

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Step 1.1

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

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Step 1.1.1

Move $y$ .

$81 x^{2} + 81 y^{2} - 126 x + 126 (y \cdot y) = 98$

Step 1.1.2

Multiply $y$ by $y$ .

$81 x^{2} + 81 y^{2} - 126 x + 126 y^{2} = 98$

Step 1.2

Add $81 y^{2}$ and $126 y^{2}$ .

$81 x^{2} + 207 y^{2} - 126 x = 98$

Step 2

Move all terms not containing $y$ to the right side of the equation.

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Step 2.1

Subtract $81 x^{2}$ from both sides of the equation.

$207 y^{2} - 126 x = 98 - 81 x^{2}$

Step 2.2

Add $126 x$ to both sides of the equation.

$207 y^{2} = 98 - 81 x^{2} + 126 x$

Step 3

Divide each term in $207 y^{2} = 98 - 81 x^{2} + 126 x$ by $207$ and simplify.

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Step 3.1

Divide each term in $207 y^{2} = 98 - 81 x^{2} + 126 x$ by $207$ .

$\frac{207 y^{2}}{207} = \frac{98}{207} + \frac{- 81 x^{2}}{207} + \frac{126 x}{207}$

Step 3.2

Simplify the left side.

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Step 3.2.1

Cancel the common factor of $207$ .

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Step 3.2.1.1

Cancel the common factor.

$\frac{207 y^{2}}{207} = \frac{98}{207} + \frac{- 81 x^{2}}{207} + \frac{126 x}{207}$

Step 3.2.1.2

Divide $y^{2}$ by $1$ .

$y^{2} = \frac{98}{207} + \frac{- 81 x^{2}}{207} + \frac{126 x}{207}$

Step 3.3

Simplify the right side.

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Step 3.3.1

Simplify each term.

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Step 3.3.1.1

Cancel the common factor of $- 81$ and $207$ .

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Step 3.3.1.1.1

Factor $9$ out of $- 81 x^{2}$ .

$y^{2} = \frac{98}{207} + \frac{9 (- 9 x^{2})}{207} + \frac{126 x}{207}$

Step 3.3.1.1.2

Cancel the common factors.

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Step 3.3.1.1.2.1

Factor $9$ out of $207$ .

$y^{2} = \frac{98}{207} + \frac{9 (- 9 x^{2})}{9 (23)} + \frac{126 x}{207}$

Step 3.3.1.1.2.2

Cancel the common factor.

$y^{2} = \frac{98}{207} + \frac{9 (- 9 x^{2})}{9 \cdot 23} + \frac{126 x}{207}$

Step 3.3.1.1.2.3

Rewrite the expression.

$y^{2} = \frac{98}{207} + \frac{- 9 x^{2}}{23} + \frac{126 x}{207}$

Step 3.3.1.2

Move the negative in front of the fraction.

$y^{2} = \frac{98}{207} - \frac{9 x^{2}}{23} + \frac{126 x}{207}$

Step 3.3.1.3

Cancel the common factor of $126$ and $207$ .

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Step 3.3.1.3.1

Factor $9$ out of $126 x$ .

$y^{2} = \frac{98}{207} - \frac{9 x^{2}}{23} + \frac{9 (14 x)}{207}$

Step 3.3.1.3.2

Cancel the common factors.

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Step 3.3.1.3.2.1

Factor $9$ out of $207$ .

$y^{2} = \frac{98}{207} - \frac{9 x^{2}}{23} + \frac{9 (14 x)}{9 (23)}$

Step 3.3.1.3.2.2

Cancel the common factor.

$y^{2} = \frac{98}{207} - \frac{9 x^{2}}{23} + \frac{9 (14 x)}{9 \cdot 23}$

Step 3.3.1.3.2.3

Rewrite the expression.

$y^{2} = \frac{98}{207} - \frac{9 x^{2}}{23} + \frac{14 x}{23}$

Step 4

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$y = \pm \sqrt{\frac{98}{207} - \frac{9 x^{2}}{23} + \frac{14 x}{23}}$

Step 5

Reorder terms.

$y = \pm \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 6

The complete solution is the result of both the positive and negative portions of the solution.

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Step 6.1

First, use the positive value of the $\pm$ to find the first solution.

$y = \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 6.2

Next, use the negative value of the $\pm$ to find the second solution.

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 6.3

The complete solution is the result of both the positive and negative portions of the solution.

$y = \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

$y = \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 7

Combine the numerators over the common denominator.

$y = \sqrt{\frac{- 9 x^{2} + 14 x}{23} + \frac{98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 8

Factor $x$ out of $- 9 x^{2} + 14 x$ .

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Step 8.1

Factor $x$ out of $- 9 x^{2}$ .

$y = \sqrt{\frac{x (- 9 x) + 14 x}{23} + \frac{98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 8.2

Factor $x$ out of $14 x$ .

$y = \sqrt{\frac{x (- 9 x) + x \cdot 14}{23} + \frac{98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 8.3

Factor $x$ out of $x (- 9 x) + x \cdot 14$ .

$y = \sqrt{\frac{x (- 9 x + 14)}{23} + \frac{98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

$y = \sqrt{\frac{x (- 9 x + 14)}{23} + \frac{98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 9

To write $\frac{x (- 9 x + 14)}{23}$ as a fraction with a common denominator, multiply by $\frac{9}{9}$ .

$y = \sqrt{\frac{x (- 9 x + 14)}{23} \cdot \frac{9}{9} + \frac{98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 10

Write each expression with a common denominator of $207$ , by multiplying each by an appropriate factor of $1$ .

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Step 10.1

Multiply $\frac{x (- 9 x + 14)}{23}$ by $\frac{9}{9}$ .

$y = \sqrt{\frac{x (- 9 x + 14) \cdot 9}{23 \cdot 9} + \frac{98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 10.2

Multiply $23$ by $9$ .

$y = \sqrt{\frac{x (- 9 x + 14) \cdot 9}{207} + \frac{98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

$y = \sqrt{\frac{x (- 9 x + 14) \cdot 9}{207} + \frac{98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 11

Combine the numerators over the common denominator.

$y = \sqrt{\frac{x (- 9 x + 14) \cdot 9 + 98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 12

Simplify the numerator.

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Step 12.1

Apply the distributive property.

$y = \sqrt{\frac{(x (- 9 x) + x \cdot 14) \cdot 9 + 98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 12.2

Rewrite using the commutative property of multiplication.

$y = \sqrt{\frac{(- 9 x \cdot x + x \cdot 14) \cdot 9 + 98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 12.3

Move $14$ to the left of $x$ .

$y = \sqrt{\frac{(- 9 x \cdot x + 14 \cdot x) \cdot 9 + 98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 12.4

Multiply $x$ by $x$ by adding the exponents.

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Step 12.4.1

Move $x$ .

$y = \sqrt{\frac{(- 9 (x \cdot x) + 14 \cdot x) \cdot 9 + 98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 12.4.2

Multiply $x$ by $x$ .

$y = \sqrt{\frac{(- 9 x^{2} + 14 \cdot x) \cdot 9 + 98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

$y = \sqrt{\frac{(- 9 x^{2} + 14 x) \cdot 9 + 98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 12.5

Apply the distributive property.

$y = \sqrt{\frac{- 9 x^{2} \cdot 9 + 14 x \cdot 9 + 98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 12.6

Multiply $9$ by $- 9$ .

$y = \sqrt{\frac{- 81 x^{2} + 14 x \cdot 9 + 98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 12.7

Multiply $9$ by $14$ .

$y = \sqrt{\frac{- 81 x^{2} + 126 x + 98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

$y = \sqrt{\frac{- 81 x^{2} + 126 x + 98}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 13

Rewrite $\frac{- 81 x^{2} + 126 x + 98}{207}$ as ${(\frac{1}{3})}^{2} \frac{- 81 x^{2} + 126 x + 98}{23}$ .

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Step 13.1

Factor the perfect power $1^{2}$ out of $- 81 x^{2} + 126 x + 98$ .

$y = \sqrt{\frac{1^{2} (- 81 x^{2} + 126 x + 98)}{207}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 13.2

Factor the perfect power $3^{2}$ out of $207$ .

$y = \sqrt{\frac{1^{2} (- 81 x^{2} + 126 x + 98)}{3^{2} \cdot 23}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 13.3

Rearrange the fraction $\frac{1^{2} (- 81 x^{2} + 126 x + 98)}{3^{2} \cdot 23}$ .

$y = \sqrt{{(\frac{1}{3})}^{2} (\frac{- 81 x^{2} + 126 x + 98}{23})}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

$y = \sqrt{{(\frac{1}{3})}^{2} (\frac{- 81 x^{2} + 126 x + 98}{23})}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 14

Pull terms out from under the radical.

$y = \frac{1}{3} \cdot \sqrt{\frac{- 81 x^{2} + 126 x + 98}{23}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 15

Rewrite $\sqrt{\frac{- 81 x^{2} + 126 x + 98}{23}}$ as $\frac{\sqrt{- 81 x^{2} + 126 x + 98}}{\sqrt{23}}$ .

$y = \frac{1}{3} \cdot \frac{\sqrt{- 81 x^{2} + 126 x + 98}}{\sqrt{23}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 16

Combine.

$y = \frac{1 \sqrt{- 81 x^{2} + 126 x + 98}}{3 \sqrt{23}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 17

Multiply $\sqrt{- 81 x^{2} + 126 x + 98}$ by $1$ .

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98}}{3 \sqrt{23}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 18

Multiply $\frac{\sqrt{- 81 x^{2} + 126 x + 98}}{3 \sqrt{23}}$ by $\frac{\sqrt{23}}{\sqrt{23}}$ .

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98}}{3 \sqrt{23}} \cdot \frac{\sqrt{23}}{\sqrt{23}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19

Combine and simplify the denominator.

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Step 19.1

Multiply $\frac{\sqrt{- 81 x^{2} + 126 x + 98}}{3 \sqrt{23}}$ by $\frac{\sqrt{23}}{\sqrt{23}}$ .

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \sqrt{23} \sqrt{23}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19.2

Move $\sqrt{23}$ .

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 (\sqrt{23} \sqrt{23})}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19.3

Raise $\sqrt{23}$ to the power of $1$ .

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 ({\sqrt{23}}^{1} \sqrt{23})}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19.4

Raise $\sqrt{23}$ to the power of $1$ .

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 ({\sqrt{23}}^{1} {\sqrt{23}}^{1})}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19.5

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

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 {\sqrt{23}}^{1 + 1}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19.6

Add $1$ and $1$ .

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 {\sqrt{23}}^{2}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19.7

Rewrite ${\sqrt{23}}^{2}$ as $23$ .

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Step 19.7.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{23}$ as $23^{\frac{1}{2}}$ .

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 {(23^{\frac{1}{2}})}^{2}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19.7.2

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

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23^{\frac{1}{2} \cdot 2}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19.7.3

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

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23^{\frac{2}{2}}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19.7.4

Cancel the common factor of $2$ .

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Step 19.7.4.1

Cancel the common factor.

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23^{\frac{2}{2}}}, - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19.7.4.2

Rewrite the expression.

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23^{1}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23^{1}}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 19.7.5

Evaluate the exponent.

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

$y = \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 20

Combine using the product rule for radicals.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{3 \cdot 23}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 21

Multiply $3$ by $23$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{- \frac{9 x^{2}}{23} + \frac{14 x}{23} + \frac{98}{207}}$

Step 22

Combine the numerators over the common denominator.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{- 9 x^{2} + 14 x}{23} + \frac{98}{207}}$

Step 23

Factor $x$ out of $- 9 x^{2} + 14 x$ .

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Step 23.1

Factor $x$ out of $- 9 x^{2}$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{x (- 9 x) + 14 x}{23} + \frac{98}{207}}$

Step 23.2

Factor $x$ out of $14 x$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{x (- 9 x) + x \cdot 14}{23} + \frac{98}{207}}$

Step 23.3

Factor $x$ out of $x (- 9 x) + x \cdot 14$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{x (- 9 x + 14)}{23} + \frac{98}{207}}$

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{x (- 9 x + 14)}{23} + \frac{98}{207}}$

Step 24

To write $\frac{x (- 9 x + 14)}{23}$ as a fraction with a common denominator, multiply by $\frac{9}{9}$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{x (- 9 x + 14)}{23} \cdot \frac{9}{9} + \frac{98}{207}}$

Step 25

Write each expression with a common denominator of $207$ , by multiplying each by an appropriate factor of $1$ .

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Step 25.1

Multiply $\frac{x (- 9 x + 14)}{23}$ by $\frac{9}{9}$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{x (- 9 x + 14) \cdot 9}{23 \cdot 9} + \frac{98}{207}}$

Step 25.2

Multiply $23$ by $9$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{x (- 9 x + 14) \cdot 9}{207} + \frac{98}{207}}$

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{x (- 9 x + 14) \cdot 9}{207} + \frac{98}{207}}$

Step 26

Combine the numerators over the common denominator.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{x (- 9 x + 14) \cdot 9 + 98}{207}}$

Step 27

Simplify the numerator.

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Step 27.1

Apply the distributive property.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{(x (- 9 x) + x \cdot 14) \cdot 9 + 98}{207}}$

Step 27.2

Rewrite using the commutative property of multiplication.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{(- 9 x \cdot x + x \cdot 14) \cdot 9 + 98}{207}}$

Step 27.3

Move $14$ to the left of $x$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{(- 9 x \cdot x + 14 \cdot x) \cdot 9 + 98}{207}}$

Step 27.4

Multiply $x$ by $x$ by adding the exponents.

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Step 27.4.1

Move $x$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{(- 9 (x \cdot x) + 14 \cdot x) \cdot 9 + 98}{207}}$

Step 27.4.2

Multiply $x$ by $x$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{(- 9 x^{2} + 14 \cdot x) \cdot 9 + 98}{207}}$

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{(- 9 x^{2} + 14 x) \cdot 9 + 98}{207}}$

Step 27.5

Apply the distributive property.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{- 9 x^{2} \cdot 9 + 14 x \cdot 9 + 98}{207}}$

Step 27.6

Multiply $9$ by $- 9$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{- 81 x^{2} + 14 x \cdot 9 + 98}{207}}$

Step 27.7

Multiply $9$ by $14$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{- 81 x^{2} + 126 x + 98}{207}}$

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{- 81 x^{2} + 126 x + 98}{207}}$

Step 28

Rewrite $\frac{- 81 x^{2} + 126 x + 98}{207}$ as ${(\frac{1}{3})}^{2} \frac{- 81 x^{2} + 126 x + 98}{23}$ .

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Step 28.1

Factor the perfect power $1^{2}$ out of $- 81 x^{2} + 126 x + 98$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{1^{2} (- 81 x^{2} + 126 x + 98)}{207}}$

Step 28.2

Factor the perfect power $3^{2}$ out of $207$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{\frac{1^{2} (- 81 x^{2} + 126 x + 98)}{3^{2} \cdot 23}}$

Step 28.3

Rearrange the fraction $\frac{1^{2} (- 81 x^{2} + 126 x + 98)}{3^{2} \cdot 23}$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{{(\frac{1}{3})}^{2} (\frac{- 81 x^{2} + 126 x + 98}{23})}$

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \sqrt{{(\frac{1}{3})}^{2} (\frac{- 81 x^{2} + 126 x + 98}{23})}$

Step 29

Pull terms out from under the radical.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - (\frac{1}{3} \cdot \sqrt{\frac{- 81 x^{2} + 126 x + 98}{23}})$

Step 30

Rewrite $\sqrt{\frac{- 81 x^{2} + 126 x + 98}{23}}$ as $\frac{\sqrt{- 81 x^{2} + 126 x + 98}}{\sqrt{23}}$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - (\frac{1}{3} \cdot \frac{\sqrt{- 81 x^{2} + 126 x + 98}}{\sqrt{23}})$

Step 31

Combine.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{1 \sqrt{- 81 x^{2} + 126 x + 98}}{3 \sqrt{23}}$

Step 32

Multiply $\sqrt{- 81 x^{2} + 126 x + 98}$ by $1$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98}}{3 \sqrt{23}}$

Step 33

Multiply $\frac{\sqrt{- 81 x^{2} + 126 x + 98}}{3 \sqrt{23}}$ by $\frac{\sqrt{23}}{\sqrt{23}}$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - (\frac{\sqrt{- 81 x^{2} + 126 x + 98}}{3 \sqrt{23}} \cdot \frac{\sqrt{23}}{\sqrt{23}})$

Step 34

Combine and simplify the denominator.

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Step 34.1

Multiply $\frac{\sqrt{- 81 x^{2} + 126 x + 98}}{3 \sqrt{23}}$ by $\frac{\sqrt{23}}{\sqrt{23}}$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \sqrt{23} \sqrt{23}}$

Step 34.2

Move $\sqrt{23}$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 (\sqrt{23} \sqrt{23})}$

Step 34.3

Raise $\sqrt{23}$ to the power of $1$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 ({\sqrt{23}}^{1} \sqrt{23})}$

Step 34.4

Raise $\sqrt{23}$ to the power of $1$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 ({\sqrt{23}}^{1} {\sqrt{23}}^{1})}$

Step 34.5

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

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 {\sqrt{23}}^{1 + 1}}$

Step 34.6

Add $1$ and $1$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 {\sqrt{23}}^{2}}$

Step 34.7

Rewrite ${\sqrt{23}}^{2}$ as $23$ .

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Step 34.7.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{23}$ as $23^{\frac{1}{2}}$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 {(23^{\frac{1}{2}})}^{2}}$

Step 34.7.2

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

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23^{\frac{1}{2} \cdot 2}}$

Step 34.7.3

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

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23^{\frac{2}{2}}}$

Step 34.7.4

Cancel the common factor of $2$ .

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Step 34.7.4.1

Cancel the common factor.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}, - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23^{\frac{2}{2}}}$

Step 34.7.4.2

Rewrite the expression.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23^{1}}$

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23^{1}}$

Step 34.7.5

Evaluate the exponent.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23}$

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23}$

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{- 81 x^{2} + 126 x + 98} \sqrt{23}}{3 \cdot 23}$

Step 35

Combine using the product rule for radicals.

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{3 \cdot 23}$

Step 36

Multiply $3$ by $23$ .

$y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

$y = - \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$

Step 37

Reorder factors in $y = \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}, - \frac{\sqrt{(- 81 x^{2} + 126 x + 98) \cdot 23}}{69}$ .

$y = \frac{\sqrt{23 (- 81 x^{2} + 126 x + 98)}}{69}$

$y = - \frac{\sqrt{23 (- 81 x^{2} + 126 x + 98)}}{69}$

Step 38

The given equation $y = \frac{\sqrt{23 (- 81 x^{2} + 126 x + 98)}}{69}, - \frac{\sqrt{23 (- 81 x^{2} + 126 x + 98)}}{69}$ can not be written as $y = k x^{2}$ , so $y$ doesn't vary directly with $x^{2}$ .

$y$ doesn't vary directly with $x$