Simplify square root of 9-x^2

$\sqrt{9 - x^{2}}$

Rewrite $9$ as $3^{2}$ .

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

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 3$ and $b = x$ .

$\sqrt{(3 + x) (3 - x)}$

Simplify square root of 9-x^2

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