$\"\"$

The expression is $\"\"$

$\"\"$ (Substitute: a = 4) $\"\"$

First find the value of $\"\"$

The radical $\"\"$ indicates positive square roots of 4.

$\"\"$ (Factorize: $\"\"$ )

$\"\"$ (Recall: $\"\"$ ) $\"\"$

Rewrite the expression

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

= 4 (Multiply: $\"\"$ )

$\"\"$

The value of the expression is 4.