Trigonometry Examples

$27 x^{3} y^{9} - 8 z^{12}$

Step 1

Rewrite $27 x^{3} y^{9}$ as ${(3 x y^{3})}^{3}$ .

${(3 x y^{3})}^{3} - 8 z^{12}$

Step 2

Rewrite $8 z^{12}$ as ${(2 z^{4})}^{3}$ .

${(3 x y^{3})}^{3} - {(2 z^{4})}^{3}$

Step 3

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

$(3 x y^{3} - (2 z^{4})) ({(3 x y^{3})}^{2} + 3 x y^{3} (2 z^{4}) + {(2 z^{4})}^{2})$

Step 4

Simplify.

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Step 4.1

Multiply $2$ by $- 1$ .

$(3 x y^{3} - 2 z^{4}) ({(3 x y^{3})}^{2} + 3 x y^{3} (2 z^{4}) + {(2 z^{4})}^{2})$

Step 4.2

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 4.2.1

Apply the product rule to $3 x y^{3}$ .

$(3 x y^{3} - 2 z^{4}) ({(3 x)}^{2} {(y^{3})}^{2} + 3 x y^{3} (2 z^{4}) + {(2 z^{4})}^{2})$

Step 4.2.2

Apply the product rule to $3 x$ .

$(3 x y^{3} - 2 z^{4}) (3^{2} x^{2} {(y^{3})}^{2} + 3 x y^{3} (2 z^{4}) + {(2 z^{4})}^{2})$

Step 4.3

Raise $3$ to the power of $2$ .

$(3 x y^{3} - 2 z^{4}) (9 x^{2} {(y^{3})}^{2} + 3 x y^{3} (2 z^{4}) + {(2 z^{4})}^{2})$

Step 4.4

Multiply the exponents in ${(y^{3})}^{2}$ .

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Step 4.4.1

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

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

Step 4.4.2

Multiply $3$ by $2$ .

$(3 x y^{3} - 2 z^{4}) (9 x^{2} y^{6} + 3 x y^{3} (2 z^{4}) + {(2 z^{4})}^{2})$

Step 4.5

Multiply $2$ by $3$ .

$(3 x y^{3} - 2 z^{4}) (9 x^{2} y^{6} + 6 x y^{3} z^{4} + {(2 z^{4})}^{2})$

Step 4.6

Apply the product rule to $2 z^{4}$ .

$(3 x y^{3} - 2 z^{4}) (9 x^{2} y^{6} + 6 x y^{3} z^{4} + 2^{2} {(z^{4})}^{2})$

Step 4.7

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

$(3 x y^{3} - 2 z^{4}) (9 x^{2} y^{6} + 6 x y^{3} z^{4} + 4 {(z^{4})}^{2})$

Step 4.8

Multiply the exponents in ${(z^{4})}^{2}$ .

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Step 4.8.1

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

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

Step 4.8.2

Multiply $4$ by $2$ .

$(3 x y^{3} - 2 z^{4}) (9 x^{2} y^{6} + 6 x y^{3} z^{4} + 4 z^{8})$