$\"\"$

The expression is $\"\"$ .

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

$\"\"$

Apply difference of two squares: $\"\"$ .

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

Apply FOIL method: $\"\"$ . \ \

$\"\"$

Apply Power of a power property: $\"\"$ .

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

The simplified expression is $\"\"$ .