Algebra Examples

$f (18) = \sqrt{18 - 2}$

Step 1

Subtract $2$ from $18$ .

$f (18) = \sqrt{16}$

Step 2

Rewrite $16$ as $4^{2}$ .

$f (18) = \sqrt{4^{2}}$

Step 3

Pull terms out from under the radical, assuming positive real numbers.

$f (18) = 4$