Precalculus Examples

$\frac{(x + 5) (x - 1)}{x^{2} + 9 x + 20}$

Factor $x^{2} + 9 x + 20$ using the AC method.

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Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $20$ and whose sum is $9$ .

$4, 5$

Write the factored form using these integers.

$\frac{(x + 5) (x - 1)}{(x + 4) (x + 5)}$

Reduce the expression $\frac{(x + 5) (x - 1)}{(x + 4) (x + 5)}$ by cancelling the common factors.

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Cancel the common factor.

$\frac{(x + 5) (x - 1)}{(x + 4) (x + 5)}$

Rewrite the expression.

$\frac{x - 1}{x + 4}$

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