Evaluate square root of 1-x^2

$\sqrt{1 - x^{2}}$

Step 1

Rewrite $1$ as $1^{2}$ .

$\sqrt{1^{2} - x^{2}}$

Step 2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = 1$ and $b = x$ .

$\sqrt{(1 + x) (1 - x)}$