$\"\"$

The expression is $\"\"$ .

Simplify the expression.

$\"\"$ (Original expression)

$\"\"$ (Rewrite the expression)

$\"\"$ (Cancel square and root terms)

$\"\"$ (Simplify)

Since $\"\"$ could not be negative, Thus can take the absolute value of $\"\"$ to identify the principal root.

$\"\"$

The simplified expression value is $\"\"$ .