$\"\"$

The expression is $\"\"$ .

$\"\"$ (Distributive property: $\"\"$ )

$\"\"$ (Product property of square roots: $\"\"$ )

$\"\"$ (Distributive property: $\"\"$ )

$\"\"$ (Substitute: $\"\"$ and $\"\"$ )

$\"\"$ (Subtraction: $\"\"$ )

$\"\"$ .

The simplified expression is $\"\"$ .

$\"\"$

$\"\"$ .