Precalculus Examples

$y^{2} = x^{2} - 64$ , $3 y = x + 8$

Step 1

Divide each term in $3 y = x + 8$ by $3$ and simplify.

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Step 1.1

Divide each term in $3 y = x + 8$ by $3$ .

$\frac{3 y}{3} = \frac{x}{3} + \frac{8}{3}$

$y^{2} = x^{2} - 64$

Step 1.2

Simplify the left side.

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Step 1.2.1

Cancel the common factor of $3$ .

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Step 1.2.1.1

Cancel the common factor.

$\frac{3 y}{3} = \frac{x}{3} + \frac{8}{3}$

$y^{2} = x^{2} - 64$

Step 1.2.1.2

Divide $y$ by $1$ .

$y = \frac{x}{3} + \frac{8}{3}$

$y^{2} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$y^{2} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$y^{2} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$y^{2} = x^{2} - 64$

Step 2

Replace all occurrences of $y$ with $\frac{x}{3} + \frac{8}{3}$ in each equation.

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Step 2.1

Replace all occurrences of $y$ in $y^{2} = x^{2} - 64$ with $\frac{x}{3} + \frac{8}{3}$ .

${(\frac{x}{3} + \frac{8}{3})}^{2} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify ${(\frac{x}{3} + \frac{8}{3})}^{2}$ .

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Step 2.2.1.1

Rewrite ${(\frac{x}{3} + \frac{8}{3})}^{2}$ as $(\frac{x}{3} + \frac{8}{3}) (\frac{x}{3} + \frac{8}{3})$ .

$(\frac{x}{3} + \frac{8}{3}) (\frac{x}{3} + \frac{8}{3}) = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.2

Expand $(\frac{x}{3} + \frac{8}{3}) (\frac{x}{3} + \frac{8}{3})$ using the FOIL Method.

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Step 2.2.1.2.1

Apply the distributive property.

$\frac{x}{3} \cdot (\frac{x}{3} + \frac{8}{3}) + \frac{8}{3} \cdot (\frac{x}{3} + \frac{8}{3}) = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.2.2

Apply the distributive property.

$\frac{x}{3} \cdot \frac{x}{3} + \frac{x}{3} \cdot \frac{8}{3} + \frac{8}{3} \cdot (\frac{x}{3} + \frac{8}{3}) = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.2.3

Apply the distributive property.

$\frac{x}{3} \cdot \frac{x}{3} + \frac{x}{3} \cdot \frac{8}{3} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{x}{3} \cdot \frac{x}{3} + \frac{x}{3} \cdot \frac{8}{3} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3

Simplify and combine like terms.

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Step 2.2.1.3.1

Simplify each term.

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Step 2.2.1.3.1.1

Multiply $\frac{x}{3} \cdot \frac{x}{3}$ .

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Step 2.2.1.3.1.1.1

Multiply $\frac{x}{3}$ by $\frac{x}{3}$ .

$\frac{x \cdot x}{3 \cdot 3} + \frac{x}{3} \cdot \frac{8}{3} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.1.2

Raise $x$ to the power of $1$ .

$\frac{x \cdot x}{3 \cdot 3} + \frac{x}{3} \cdot \frac{8}{3} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.1.3

Raise $x$ to the power of $1$ .

$\frac{x \cdot x}{3 \cdot 3} + \frac{x}{3} \cdot \frac{8}{3} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.1.4

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

$\frac{x^{1 + 1}}{3 \cdot 3} + \frac{x}{3} \cdot \frac{8}{3} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.1.5

Add $1$ and $1$ .

$\frac{x^{2}}{3 \cdot 3} + \frac{x}{3} \cdot \frac{8}{3} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.1.6

Multiply $3$ by $3$ .

$\frac{x^{2}}{9} + \frac{x}{3} \cdot \frac{8}{3} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{x^{2}}{9} + \frac{x}{3} \cdot \frac{8}{3} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.2

Multiply $\frac{x}{3} \cdot \frac{8}{3}$ .

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Step 2.2.1.3.1.2.1

Multiply $\frac{x}{3}$ by $\frac{8}{3}$ .

$\frac{x^{2}}{9} + \frac{x \cdot 8}{3 \cdot 3} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.2.2

Multiply $3$ by $3$ .

$\frac{x^{2}}{9} + \frac{x \cdot 8}{9} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{x^{2}}{9} + \frac{x \cdot 8}{9} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.3

Move $8$ to the left of $x$ .

$\frac{x^{2}}{9} + \frac{8 \cdot x}{9} + \frac{8}{3} \cdot \frac{x}{3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.4

Multiply $\frac{8}{3} \cdot \frac{x}{3}$ .

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Step 2.2.1.3.1.4.1

Multiply $\frac{8}{3}$ by $\frac{x}{3}$ .

$\frac{x^{2}}{9} + \frac{8 x}{9} + \frac{8 x}{3 \cdot 3} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.4.2

Multiply $3$ by $3$ .

$\frac{x^{2}}{9} + \frac{8 x}{9} + \frac{8 x}{9} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{x^{2}}{9} + \frac{8 x}{9} + \frac{8 x}{9} + \frac{8}{3} \cdot \frac{8}{3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.5

Multiply $\frac{8}{3} \cdot \frac{8}{3}$ .

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Step 2.2.1.3.1.5.1

Multiply $\frac{8}{3}$ by $\frac{8}{3}$ .

$\frac{x^{2}}{9} + \frac{8 x}{9} + \frac{8 x}{9} + \frac{8 \cdot 8}{3 \cdot 3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.5.2

Multiply $8$ by $8$ .

$\frac{x^{2}}{9} + \frac{8 x}{9} + \frac{8 x}{9} + \frac{64}{3 \cdot 3} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.1.5.3

Multiply $3$ by $3$ .

$\frac{x^{2}}{9} + \frac{8 x}{9} + \frac{8 x}{9} + \frac{64}{9} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{x^{2}}{9} + \frac{8 x}{9} + \frac{8 x}{9} + \frac{64}{9} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{x^{2}}{9} + \frac{8 x}{9} + \frac{8 x}{9} + \frac{64}{9} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.3.2

Add $\frac{8 x}{9}$ and $\frac{8 x}{9}$ .

$\frac{x^{2}}{9} + 2 (\frac{8 x}{9}) + \frac{64}{9} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{x^{2}}{9} + 2 (\frac{8 x}{9}) + \frac{64}{9} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.4

Multiply $2 \frac{8 x}{9}$ .

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Step 2.2.1.4.1

Combine $2$ and $\frac{8 x}{9}$ .

$\frac{x^{2}}{9} + \frac{2 (8 x)}{9} + \frac{64}{9} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 2.2.1.4.2

Multiply $8$ by $2$ .

$\frac{x^{2}}{9} + \frac{16 x}{9} + \frac{64}{9} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{x^{2}}{9} + \frac{16 x}{9} + \frac{64}{9} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{x^{2}}{9} + \frac{16 x}{9} + \frac{64}{9} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{x^{2}}{9} + \frac{16 x}{9} + \frac{64}{9} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{x^{2}}{9} + \frac{16 x}{9} + \frac{64}{9} = x^{2} - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3

Solve for $x$ in $\frac{x^{2}}{9} + \frac{16 x}{9} + \frac{64}{9} = x^{2} - 64$ .

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Step 3.1

Move all terms containing $x$ to the left side of the equation.

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Step 3.1.1

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

$\frac{x^{2}}{9} + \frac{16 x}{9} + \frac{64}{9} - x^{2} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.2

To write $- x^{2}$ as a fraction with a common denominator, multiply by $\frac{9}{9}$ .

$\frac{16 x}{9} + \frac{64}{9} + \frac{x^{2}}{9} - x^{2} \cdot \frac{9}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.3

Combine $- x^{2}$ and $\frac{9}{9}$ .

$\frac{16 x}{9} + \frac{64}{9} + \frac{x^{2}}{9} + \frac{- x^{2} \cdot 9}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.4

Combine the numerators over the common denominator.

$\frac{16 x}{9} + \frac{64}{9} + \frac{x^{2} - x^{2} \cdot 9}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.5

Combine the numerators over the common denominator.

$\frac{16 x + 64 + x^{2} - x^{2} \cdot 9}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.6

Multiply $9$ by $- 1$ .

$\frac{16 x + 64 + x^{2} - 9 x^{2}}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.7

Subtract $9 x^{2}$ from $x^{2}$ .

$\frac{16 x + 64 - 8 x^{2}}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8

Simplify the numerator.

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Step 3.1.8.1

Factor $8$ out of $16 x + 64 - 8 x^{2}$ .

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Step 3.1.8.1.1

Factor $8$ out of $16 x$ .

$\frac{8 (2 x) + 64 - 8 x^{2}}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8.1.2

Factor $8$ out of $64$ .

$\frac{8 (2 x) + 8 (8) - 8 x^{2}}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8.1.3

Factor $8$ out of $- 8 x^{2}$ .

$\frac{8 (2 x) + 8 (8) + 8 (- x^{2})}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8.1.4

Factor $8$ out of $8 (2 x) + 8 (8)$ .

$\frac{8 (2 x + 8) + 8 (- x^{2})}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8.1.5

Factor $8$ out of $8 (2 x + 8) + 8 (- x^{2})$ .

$\frac{8 (2 x + 8 - x^{2})}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{8 (2 x + 8 - x^{2})}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8.2

Factor by grouping.

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Step 3.1.8.2.1

Reorder terms.

$\frac{8 (- x^{2} + 2 x + 8)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8.2.2

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 $a \cdot c = - 1 \cdot 8 = - 8$ and whose sum is $b = 2$ .

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Step 3.1.8.2.2.1

Factor $2$ out of $2 x$ .

$\frac{8 (- x^{2} + 2 (x) + 8)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8.2.2.2

Rewrite $2$ as $- 2$ plus $4$

$\frac{8 (- x^{2} + (- 2 + 4) x + 8)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8.2.2.3

Apply the distributive property.

$\frac{8 (- x^{2} - 2 x + 4 x + 8)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{8 (- x^{2} - 2 x + 4 x + 8)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8.2.3

Factor out the greatest common factor from each group.

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Step 3.1.8.2.3.1

Group the first two terms and the last two terms.

$\frac{8 ((- x^{2} - 2 x) + 4 x + 8)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8.2.3.2

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

$\frac{8 (x (- x - 2) - 4 (- x - 2))}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{8 (x (- x - 2) - 4 (- x - 2))}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.8.2.4

Factor the polynomial by factoring out the greatest common factor, $- x - 2$ .

$\frac{8 ((- x - 2) (x - 4))}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{8 (- x - 2) (x - 4)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{8 (- x - 2) (x - 4)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.9

Factor $- 1$ out of $- x$ .

$\frac{8 (- (x) - 2) (x - 4)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.10

Rewrite $- 2$ as $- 1 (2)$ .

$\frac{8 (- (x) - 1 \cdot 2) (x - 4)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.11

Factor $- 1$ out of $- (x) - 1 (2)$ .

$\frac{8 (- (x + 2)) (x - 4)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.12

Rewrite $- (x + 2)$ as $- 1 (x + 2)$ .

$\frac{8 (- 1 (x + 2)) (x - 4)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.13

Move the negative in front of the fraction.

$- \frac{(8 (x + 2)) (x - 4)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.1.14

Reorder factors in $- \frac{(8 (x + 2)) (x - 4)}{9}$ .

$- \frac{8 (x + 2) (x - 4)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$- \frac{8 (x + 2) (x - 4)}{9} = - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.2

Multiply both sides of the equation by $\frac{1}{- \frac{1}{9} \cdot 8}$ .

$\frac{1}{- \frac{1}{9} \cdot 8} \cdot (- \frac{8 (x + 2) (x - 4)}{9}) = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3

Simplify both sides of the equation.

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Step 3.3.1

Simplify the left side.

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Step 3.3.1.1

Simplify $\frac{1}{- \frac{1}{9} \cdot 8} (- \frac{8 (x + 2) (x - 4)}{9})$ .

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Step 3.3.1.1.1

Simplify terms.

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Step 3.3.1.1.1.1

Cancel the common factor of $8$ .

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Step 3.3.1.1.1.1.1

Move the leading negative in $- \frac{8 (x + 2) (x - 4)}{9}$ into the numerator.

$\frac{1}{- \frac{1}{9} \cdot 8} \cdot \frac{- 8 (x + 2) (x - 4)}{9} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.1.2

Factor $8$ out of $- \frac{1}{9} \cdot 8$ .

$\frac{1}{8 \cdot (- \frac{1}{9})} \cdot \frac{- 8 (x + 2) (x - 4)}{9} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.1.3

Factor $8$ out of $- 8 (x + 2) (x - 4)$ .

$\frac{1}{8 \cdot (- \frac{1}{9})} \cdot \frac{8 (- (x + 2) (x - 4))}{9} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.1.4

Cancel the common factor.

$\frac{1}{8 \cdot (- \frac{1}{9})} \cdot \frac{8 (- (x + 2) (x - 4))}{9} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.1.5

Rewrite the expression.

$\frac{1}{- \frac{1}{9}} \cdot \frac{- (x + 2) (x - 4)}{9} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{1}{- \frac{1}{9}} \cdot \frac{- (x + 2) (x - 4)}{9} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.2

Multiply $\frac{1}{- \frac{1}{9}}$ by $\frac{- (x + 2) (x - 4)}{9}$ .

$\frac{- (x + 2) (x - 4)}{- \frac{1}{9} \cdot 9} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.3

Multiply $9$ by $- 1$ .

$\frac{- (x + 2) (x - 4)}{- 9 (\frac{1}{9})} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.4

Combine $- 9$ and $\frac{1}{9}$ .

$\frac{- (x + 2) (x - 4)}{\frac{- 9}{9}} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.5

Cancel the common factor of $- 9$ and $9$ .

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Step 3.3.1.1.1.5.1

Factor $9$ out of $- 9$ .

$\frac{- (x + 2) (x - 4)}{\frac{9 \cdot - 1}{9}} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.5.2

Cancel the common factors.

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Step 3.3.1.1.1.5.2.1

Factor $9$ out of $9$ .

$\frac{- (x + 2) (x - 4)}{\frac{9 \cdot - 1}{9 (1)}} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.5.2.2

Cancel the common factor.

$\frac{- (x + 2) (x - 4)}{\frac{9 \cdot - 1}{9 \cdot 1}} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.5.2.3

Rewrite the expression.

$\frac{- (x + 2) (x - 4)}{\frac{- 1}{1}} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.5.2.4

Divide $- 1$ by $1$ .

$\frac{- (x + 2) (x - 4)}{- 1} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{- (x + 2) (x - 4)}{- 1} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$\frac{- (x + 2) (x - 4)}{- 1} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.6

Dividing two negative values results in a positive value.

$\frac{(x + 2) (x - 4)}{1} = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.1.7

Divide $(x + 2) (x - 4)$ by $1$ .

$(x + 2) (x - 4) = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$(x + 2) (x - 4) = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.2

Expand $(x + 2) (x - 4)$ using the FOIL Method.

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Step 3.3.1.1.2.1

Apply the distributive property.

$x (x - 4) + 2 (x - 4) = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.2.2

Apply the distributive property.

$x \cdot x + x \cdot - 4 + 2 (x - 4) = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.2.3

Apply the distributive property.

$x \cdot x + x \cdot - 4 + 2 x + 2 \cdot - 4 = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$x \cdot x + x \cdot - 4 + 2 x + 2 \cdot - 4 = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.3

Simplify and combine like terms.

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Step 3.3.1.1.3.1

Simplify each term.

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Step 3.3.1.1.3.1.1

Multiply $x$ by $x$ .

$x^{2} + x \cdot - 4 + 2 x + 2 \cdot - 4 = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.3.1.2

Move $- 4$ to the left of $x$ .

$x^{2} - 4 \cdot x + 2 x + 2 \cdot - 4 = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.3.1.3

Multiply $2$ by $- 4$ .

$x^{2} - 4 x + 2 x - 8 = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$x^{2} - 4 x + 2 x - 8 = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.1.1.3.2

Add $- 4 x$ and $2 x$ .

$x^{2} - 2 x - 8 = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$x^{2} - 2 x - 8 = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$x^{2} - 2 x - 8 = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$x^{2} - 2 x - 8 = \frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2

Simplify the right side.

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Step 3.3.2.1

Simplify $\frac{1}{- \frac{1}{9} \cdot 8} \cdot - 64$ .

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Step 3.3.2.1.1

Simplify the denominator.

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Step 3.3.2.1.1.1

Multiply $8$ by $- 1$ .

$x^{2} - 2 x - 8 = \frac{1}{- 8 (\frac{1}{9})} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2.1.1.2

Combine $- 8$ and $\frac{1}{9}$ .

$x^{2} - 2 x - 8 = \frac{1}{\frac{- 8}{9}} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$x^{2} - 2 x - 8 = \frac{1}{\frac{- 8}{9}} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2.1.2

Reduce the expression by cancelling the common factors.

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Step 3.3.2.1.2.1

Move the negative in front of the fraction.

$x^{2} - 2 x - 8 = \frac{1}{- \frac{8}{9}} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2.1.2.2

Cancel the common factor of $1$ and $- 1$ .

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Step 3.3.2.1.2.2.1

Rewrite $1$ as $- 1 (- 1)$ .

$x^{2} - 2 x - 8 = \frac{- 1 \cdot - 1}{- \frac{8}{9}} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2.1.2.2.2

Move the negative in front of the fraction.

$x^{2} - 2 x - 8 = - \frac{1}{\frac{8}{9}} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$x^{2} - 2 x - 8 = - \frac{1}{\frac{8}{9}} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

$x^{2} - 2 x - 8 = - \frac{1}{\frac{8}{9}} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2.1.3

Multiply the numerator by the reciprocal of the denominator.

$x^{2} - 2 x - 8 = - 1 (\frac{9}{8}) \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2.1.4

Multiply $\frac{9}{8}$ by $1$ .

$x^{2} - 2 x - 8 = - \frac{9}{8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2.1.5

Cancel the common factor of $8$ .

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Step 3.3.2.1.5.1

Move the leading negative in $- \frac{9}{8}$ into the numerator.

$x^{2} - 2 x - 8 = \frac{- 9}{8} \cdot - 64$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2.1.5.2

Factor $8$ out of $- 64$ .

$x^{2} - 2 x - 8 = \frac{- 9}{8} \cdot (8 (- 8))$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2.1.5.3

Cancel the common factor.

$x^{2} - 2 x - 8 = \frac{- 9}{8} \cdot (8 \cdot - 8)$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2.1.5.4

Rewrite the expression.

$x^{2} - 2 x - 8 = - 9 \cdot - 8$

$y = \frac{x}{3} + \frac{8}{3}$

$x^{2} - 2 x - 8 = - 9 \cdot - 8$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.3.2.1.6

Multiply $- 9$ by $- 8$ .

$x^{2} - 2 x - 8 = 72$

$y = \frac{x}{3} + \frac{8}{3}$

$x^{2} - 2 x - 8 = 72$

$y = \frac{x}{3} + \frac{8}{3}$

$x^{2} - 2 x - 8 = 72$

$y = \frac{x}{3} + \frac{8}{3}$

$x^{2} - 2 x - 8 = 72$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.4

Subtract $72$ from both sides of the equation.

$x^{2} - 2 x - 8 - 72 = 0$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.5

Subtract $72$ from $- 8$ .

$x^{2} - 2 x - 80 = 0$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.6

Factor $x^{2} - 2 x - 80$ using the AC method.

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Step 3.6.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $- 80$ and whose sum is $- 2$ .

$- 10, 8$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.6.2

Write the factored form using these integers.

$(x - 10) (x + 8) = 0$

$y = \frac{x}{3} + \frac{8}{3}$

$(x - 10) (x + 8) = 0$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.7

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

$x - 10 = 0$

$x + 8 = 0$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.8

Set $x - 10$ equal to $0$ and solve for $x$ .

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Step 3.8.1

Set $x - 10$ equal to $0$ .

$x - 10 = 0$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.8.2

Add $10$ to both sides of the equation.

$x = 10$

$y = \frac{x}{3} + \frac{8}{3}$

$x = 10$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.9

Set $x + 8$ equal to $0$ and solve for $x$ .

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Step 3.9.1

Set $x + 8$ equal to $0$ .

$x + 8 = 0$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.9.2

Subtract $8$ from both sides of the equation.

$x = - 8$

$y = \frac{x}{3} + \frac{8}{3}$

$x = - 8$

$y = \frac{x}{3} + \frac{8}{3}$

Step 3.10

The final solution is all the values that make $(x - 10) (x + 8) = 0$ true.

$x = 10, - 8$

$y = \frac{x}{3} + \frac{8}{3}$

$x = 10, - 8$

$y = \frac{x}{3} + \frac{8}{3}$

Step 4

Replace all occurrences of $x$ with $10$ in each equation.

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Step 4.1

Replace all occurrences of $x$ in $y = \frac{x}{3} + \frac{8}{3}$ with $10$ .

$y = \frac{10}{3} + \frac{8}{3}$

$x = 10$

Step 4.2

Simplify the right side.

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Step 4.2.1

Simplify $\frac{10}{3} + \frac{8}{3}$ .

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Step 4.2.1.1

Combine the numerators over the common denominator.

$y = \frac{10 + 8}{3}$

$x = 10$

Step 4.2.1.2

Simplify the expression.

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Step 4.2.1.2.1

Add $10$ and $8$ .

$y = \frac{18}{3}$

$x = 10$

Step 4.2.1.2.2

Divide $18$ by $3$ .

$y = 6$

$x = 10$

$y = 6$

$x = 10$

$y = 6$

$x = 10$

$y = 6$

$x = 10$

$y = 6$

$x = 10$

Step 5

Replace all occurrences of $x$ with $- 8$ in each equation.

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Step 5.1

Replace all occurrences of $x$ in $y = \frac{x}{3} + \frac{8}{3}$ with $- 8$ .

$y = \frac{- 8}{3} + \frac{8}{3}$

$x = - 8$

Step 5.2

Simplify the right side.

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Step 5.2.1

Simplify $\frac{- 8}{3} + \frac{8}{3}$ .

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Step 5.2.1.1

Combine the numerators over the common denominator.

$y = \frac{- 8 + 8}{3}$

$x = - 8$

Step 5.2.1.2

Simplify the expression.

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Step 5.2.1.2.1

Add $- 8$ and $8$ .

$y = \frac{0}{3}$

$x = - 8$

Step 5.2.1.2.2

Divide $0$ by $3$ .

$y = 0$

$x = - 8$

$y = 0$

$x = - 8$

$y = 0$

$x = - 8$

$y = 0$

$x = - 8$

$y = 0$

$x = - 8$

Step 6

The solution to the system is the complete set of ordered pairs that are valid solutions.

$(10, 6)$

$(- 8, 0)$

Step 7

The result can be shown in multiple forms.

Point Form:

$(10, 6), (- 8, 0)$

Equation Form:

$x = 10, y = 6$

$x = - 8, y = 0$

Step 8