$\"\"$

The expression is $\"\"$ .

(Multiply numerator and denominator by the conjugate $\"\"$ .

$\"\"$

$\"\"$ (Apply distributive property: $\"\"$ )

Product of sum and difference property: $\"\"$ .

$\"\"$

$\"\"$ (Evaluate powers: $\"\"$ and $\"\"$ )

$\"\"$ (Subtract: $\"\"$ )

$\"\"$ .

Therefore, the simplified expression is $\"\"$ .

$\"\"$

$\"\"$ .