$\"\"$

$\"\"$ (Rewrite 90 as $\"\"$ )

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

The radical $\"\"$ indicates the positive square root of 9.

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

Substitute the value in the expression

$\"\"$

$\"\"$ (Find the value using a calculator: $\"\"$ )

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

$\"\"$ (Round it to the nearest hundredth) $\"\"$

The square root is 10.0.