$\"\"$

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The expression is $\"\"$ .

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

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$\"\"$ (Product property of square roots: $\"\"$ )

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$\"\"$ (Substitute: $\"\"$ and $\"\"$ )

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$\"\"$ (Addition: $\"\"$ )

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$\"\"$ .

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The simplified expression is $\"\"$ .

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$\"\"$

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$\"\"$ .