$\"\"$

Rewrite the expression using perfect square roots.

$\"\"$ (The factors of 72 = 9 $\"\"$ 8)

Rewrite the expression using product property of square roots;

For nonnegative real numbers a and b, $\"\"$ .

$\"\"$

Positive square root of: $\"\"$ and $\"\"$ .

$\"\"$ $\"\"$

Rewrite the expression using product property of square roots;

For nonnegative real numbers a and b, $\"\"$ .

$\"\"$

Positive square root of: $\"\"$ .

$\"\"$

$\"\"$ (Simplify) $\"\"$

The simplified expression is $\"\"$ .