Algebra Examples

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

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

Step 1

Rewrite

1

$1$ as

1^{2}

$1^{2}$ .

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

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

Step 2

Since both terms are perfect squares, factor using the difference of squares formula,

a^{2} - b^{2} = (a + b) (a - b)

$a^{2} - b^{2} = (a + b) (a - b)$ where

a = x

$a = x$ and

b = 1

$b = 1$ .

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

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

Step 3

Reduce the expression

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

$\frac{(x + 1) (x - 1)}{(x + 1) (x^{2} + 2 x + 3)}$ by cancelling the common factors.

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Step 3.1

Cancel the common factor.

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

Step 3.2

Rewrite the expression.

$\frac{x - 1}{x^{2} + 2 x + 3}$

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