$\"\"$

Rewrite the expression using perfect square roots.

$\"\"$ (The factors of 20 = 4 $\"\"$ 5)

Rewrite the expression using product property of square roots;

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

$\"\"$

$\"\"$ (Positive square root of: $\"\"$ )

$\"\"$ (Multiply: $\"\"$ ) $\"\"$

The simplified expression is $\"\"$ .