$\"\"$

The expression is $\"\"$ .

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

$\"\"$

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

$\"\"$ (Product of sum and difference property: $\"\"$ )

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

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

$\"\"$ (Simplify)

$\"\"$ .

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

$\"\"$ .