Pre-Algebra Examples

$(x^{3} + 1) \div (x + 1)$

Step 1

Rewrite the division as a fraction.

$\frac{x^{3} + 1}{x + 1}$

Step 2

Simplify the numerator.

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Step 2.1

Rewrite $1$ as $1^{3}$ .

$\frac{x^{3} + 1^{3}}{x + 1}$

Step 2.2

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 $a = x$ and $b = 1$ .

$\frac{(x + 1) (x^{2} - x \cdot 1 + 1^{2})}{x + 1}$

Step 2.3

Simplify.

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Step 2.3.1

Multiply $- 1$ by $1$ .

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

Step 2.3.2

One to any power is one.

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

Step 3

Cancel the common factor of $x + 1$ .

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Step 3.1

Cancel the common factor.

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

Step 3.2

Divide $x^{2} - x + 1$ by $1$ .

$x^{2} - x + 1$