Precalculus Examples

$x^{2} - 9$

Step 1

Rewrite

$9$ as

$3^{2}$ .

$x^{2} - 3^{2}$

Step 2

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

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

$a = x$ and

$b = 3$ .

$(x + 3) (x - 3)$

Enter YOUR Problem

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$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$