Algebra Examples

$\frac{2 w y + 3 y x - 8 w z - 12 z x}{y^{2} - 16 z^{2}} \times \frac{y^{3} + 64 z^{3}}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 1

Simplify the numerator.

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Step 1.1

Factor out the greatest common factor from each group.

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Step 1.1.1

Group the first two terms and the last two terms.

$\frac{(2 w y + 3 y x) - 8 w z - 12 z x}{y^{2} - 16 z^{2}} \cdot \frac{y^{3} + 64 z^{3}}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 1.1.2

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

$\frac{y (2 w + 3 x) - 4 z (2 w + 3 x)}{y^{2} - 16 z^{2}} \cdot \frac{y^{3} + 64 z^{3}}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 1.2

Factor the polynomial by factoring out the greatest common factor, $2 w + 3 x$ .

$\frac{(2 w + 3 x) (y - 4 z)}{y^{2} - 16 z^{2}} \cdot \frac{y^{3} + 64 z^{3}}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 2

Simplify the denominator.

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Step 2.1

Rewrite $16 z^{2}$ as ${(4 z)}^{2}$ .

$\frac{(2 w + 3 x) (y - 4 z)}{y^{2} - {(4 z)}^{2}} \cdot \frac{y^{3} + 64 z^{3}}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 2.2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = y$ and $b = 4 z$ .

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - (4 z))} \cdot \frac{y^{3} + 64 z^{3}}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 2.3

Multiply $4$ by $- 1$ .

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{y^{3} + 64 z^{3}}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 3

Simplify the numerator.

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Step 3.1

Rewrite $64 z^{3}$ as ${(4 z)}^{3}$ .

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{y^{3} + {(4 z)}^{3}}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 3.2

Since both terms are perfect cubes, factor using the sum of cubes formula, $a^{3} + b^{3} = (a + b) (a^{2} - a b + b^{2})$ where $a = y$ and $b = 4 z$ .

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - y (4 z) + {(4 z)}^{2})}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 3.3

Simplify.

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Step 3.3.1

Rewrite using the commutative property of multiplication.

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 1 \cdot 4 y z + {(4 z)}^{2})}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 3.3.2

Multiply $- 1$ by $4$ .

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + {(4 z)}^{2})}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 3.3.3

Apply the product rule to $4 z$ .

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + 4^{2} z^{2})}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 3.3.4

Raise $4$ to the power of $2$ .

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 4

Factor by grouping.

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Step 4.1

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 $a \cdot c = 6 \cdot 6 = 36$ and whose sum is $b = 13$ .

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Step 4.1.1

Reorder terms.

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{6 w^{2} + 6 x^{2} + 13 w x}$

Step 4.1.2

Reorder $6 x^{2}$ and $13 w x$ .

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{6 w^{2} + 13 w x + 6 x^{2}}$

Step 4.1.3

Factor $13$ out of $13 w x$ .

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{6 w^{2} + 13 (w x) + 6 x^{2}}$

Step 4.1.4

Rewrite $13$ as $4$ plus $9$

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{6 w^{2} + (4 + 9) (w x) + 6 x^{2}}$

Step 4.1.5

Apply the distributive property.

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{6 w^{2} + 4 (w x) + 9 (w x) + 6 x^{2}}$

Step 4.1.6

Move parentheses.

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{6 w^{2} + 4 w x + 9 w x + 6 x^{2}}$

Step 4.2

Factor out the greatest common factor from each group.

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Step 4.2.1

Group the first two terms and the last two terms.

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{(6 w^{2} + 4 w x) + 9 w x + 6 x^{2}}$

Step 4.2.2

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

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{2 w (3 w + 2 x) + 3 x (3 w + 2 x)}$

Step 4.3

Factor the polynomial by factoring out the greatest common factor, $3 w + 2 x$ .

$\frac{(2 w + 3 x) (y - 4 z)}{(y + 4 z) (y - 4 z)} \cdot \frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{(3 w + 2 x) (2 w + 3 x)}$

Step 5

Combine.

$\frac{(2 w + 3 x) (y - 4 z) ((y + 4 z) (y^{2} - 4 y z + 16 z^{2}))}{(y + 4 z) (y - 4 z) ((3 w + 2 x) (2 w + 3 x))}$

Step 6

Cancel the common factor of $2 w + 3 x$ .

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Step 6.1

Cancel the common factor.

$\frac{(2 w + 3 x) (y - 4 z) ((y + 4 z) (y^{2} - 4 y z + 16 z^{2}))}{(y + 4 z) (y - 4 z) ((3 w + 2 x) (2 w + 3 x))}$

Step 6.2

Rewrite the expression.

$\frac{(y - 4 z) ((y + 4 z) (y^{2} - 4 y z + 16 z^{2}))}{(y + 4 z) (y - 4 z) (3 w + 2 x)}$

Step 7

Cancel the common factor of $y - 4 z$ .

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Step 7.1

Cancel the common factor.

$\frac{(y - 4 z) ((y + 4 z) (y^{2} - 4 y z + 16 z^{2}))}{(y + 4 z) (y - 4 z) (3 w + 2 x)}$

Step 7.2

Rewrite the expression.

$\frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{(y + 4 z) (3 w + 2 x)}$

Step 8

Cancel the common factor of $y + 4 z$ .

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Step 8.1

Cancel the common factor.

$\frac{(y + 4 z) (y^{2} - 4 y z + 16 z^{2})}{(y + 4 z) (3 w + 2 x)}$

Step 8.2

Rewrite the expression.

$\frac{y^{2} - 4 y z + 16 z^{2}}{3 w + 2 x}$