Algebra Examples

$\frac{1}{27} x^{3} + \frac{1}{125} y^{3}$

Step 1

Rewrite $\frac{1}{27} x^{3}$ as ${(\frac{1}{3} x)}^{3}$ .

${(\frac{1}{3} x)}^{3} + \frac{1}{125} y^{3}$

Step 2

Rewrite $\frac{1}{125} y^{3}$ as ${(\frac{1}{5} y)}^{3}$ .

${(\frac{1}{3} x)}^{3} + {(\frac{1}{5} y)}^{3}$

Step 3

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 $a = \frac{1}{3} x$ and $b = \frac{1}{5} y$ .

$(\frac{1}{3} x + \frac{1}{5} y) ({(\frac{1}{3} x)}^{2} - (\frac{1}{3} x) (\frac{1}{5} y) + {(\frac{1}{5} y)}^{2})$

Step 4

Simplify.

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Step 4.1

Combine $\frac{1}{3}$ and $x$ .

$(\frac{x}{3} + \frac{1}{5} y) ({(\frac{1}{3} x)}^{2} - (\frac{1}{3} x) (\frac{1}{5} y) + {(\frac{1}{5} y)}^{2})$

Step 4.2

Combine $\frac{1}{5}$ and $y$ .

$(\frac{x}{3} + \frac{y}{5}) ({(\frac{1}{3} x)}^{2} - (\frac{1}{3} x) (\frac{1}{5} y) + {(\frac{1}{5} y)}^{2})$

Step 4.3

Combine $\frac{1}{3}$ and $x$ .

$(\frac{x}{3} + \frac{y}{5}) ({(\frac{x}{3})}^{2} - (\frac{1}{3} x) (\frac{1}{5} y) + {(\frac{1}{5} y)}^{2})$

Step 4.4

Apply the product rule to $\frac{x}{3}$ .

$(\frac{x}{3} + \frac{y}{5}) (\frac{x^{2}}{3^{2}} - (\frac{1}{3} x) (\frac{1}{5} y) + {(\frac{1}{5} y)}^{2})$

Step 4.5

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

$(\frac{x}{3} + \frac{y}{5}) (\frac{x^{2}}{9} - (\frac{1}{3} x) (\frac{1}{5} y) + {(\frac{1}{5} y)}^{2})$

Step 4.6

Combine $\frac{1}{3}$ and $x$ .

$(\frac{x}{3} + \frac{y}{5}) (\frac{x^{2}}{9} - \frac{x}{3} (\frac{1}{5} y) + {(\frac{1}{5} y)}^{2})$

Step 4.7

Combine $\frac{1}{5}$ and $y$ .

$(\frac{x}{3} + \frac{y}{5}) (\frac{x^{2}}{9} - \frac{x}{3} \cdot \frac{y}{5} + {(\frac{1}{5} y)}^{2})$

Step 4.8

Multiply $- \frac{x}{3} \cdot \frac{y}{5}$ .

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Step 4.8.1

Multiply $\frac{y}{5}$ by $\frac{x}{3}$ .

$(\frac{x}{3} + \frac{y}{5}) (\frac{x^{2}}{9} - \frac{y x}{5 \cdot 3} + {(\frac{1}{5} y)}^{2})$

Step 4.8.2

Multiply $5$ by $3$ .

$(\frac{x}{3} + \frac{y}{5}) (\frac{x^{2}}{9} - \frac{y x}{15} + {(\frac{1}{5} y)}^{2})$

Step 4.9

Combine $\frac{1}{5}$ and $y$ .

$(\frac{x}{3} + \frac{y}{5}) (\frac{x^{2}}{9} - \frac{y x}{15} + {(\frac{y}{5})}^{2})$

Step 4.10

Apply the product rule to $\frac{y}{5}$ .

$(\frac{x}{3} + \frac{y}{5}) (\frac{x^{2}}{9} - \frac{y x}{15} + \frac{y^{2}}{5^{2}})$

Step 4.11

Raise $5$ to the power of $2$ .

$(\frac{x}{3} + \frac{y}{5}) (\frac{x^{2}}{9} - \frac{y x}{15} + \frac{y^{2}}{25})$

Step 4.12

Factor.

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Step 4.12.1

Factor $\frac{1}{225}$ out of each term.

$(\frac{x}{3} + \frac{y}{5}) (\frac{1}{225} (25 x^{2} - 15 y x + 9 y^{2}))$

Step 4.12.2

Remove unnecessary parentheses.

$(\frac{x}{3} + \frac{y}{5}) \frac{1}{225} (25 x^{2} - 15 y x + 9 y^{2})$