$\"\"$

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The expression is $\"\"$ .

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Simplify the expression.

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$\"\"$ (Original expression)

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$\"\"$ (Rationalised by $\"\"$ )

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$\"\"$ (Multiply)

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$\"\"$ (Algebraic formula: $\"\"$ )

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$\"\"$ (Difference of squares: $\"\"$ )

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$\"\"$ (Multiply exponents)

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$\"\"$ (Definition of $\"\"$ )

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$\"\"$ .

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$\"\"$

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The simplified expression value is $\"\"$ .