Algebra Examples

$125 - 8 x^{3}$

Step 1

Rewrite $125$ as $5^{3}$ .

$5^{3} - 8 x^{3}$

Step 2

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

$5^{3} - {(2 x)}^{3}$

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 $a = 5$ and $b = 2 x$ .

$(5 - (2 x)) (5^{2} + 5 (2 x) + {(2 x)}^{2})$

Step 4

Simplify.

Tap for more steps...

Step 4.1

Multiply $2$ by $- 1$ .

$(5 - 2 x) (5^{2} + 5 (2 x) + {(2 x)}^{2})$

Step 4.2

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

$(5 - 2 x) (25 + 5 (2 x) + {(2 x)}^{2})$

Step 4.3

Multiply $2$ by $5$ .

$(5 - 2 x) (25 + 10 x + {(2 x)}^{2})$

Step 4.4

Apply the product rule to $2 x$ .

$(5 - 2 x) (25 + 10 x + 2^{2} x^{2})$

Step 4.5

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

$(5 - 2 x) (25 + 10 x + 4 x^{2})$