$\"\"$

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The expression is $\"\"$ .

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Apply product of a sum and a difference: $\"\"$ .

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$\"\"$

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$\"\"$

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Rewrite as the difference of two products.

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$\"\"$

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Apply distributive property: $\"\"$ .

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$\"\"$

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$\"\"$ . $\"\"$

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The value of $\"\"$ .