$\"\"$

The expression is $\"\"$ .

$\"\"$

1) Multiply numerator and denominator by $\"\"$ because $\"\"$ is the conjugate of $\"\"$ .

$\"\"$ $\"\"$

Apply difference of square formula $\"\"$ .

$\"\"$

Apply sum of square formula $\"\"$ .

$\"\"$ $\"\"$

The simplified expression is $\"\"$ .