$\"\"$

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The expression is . $\"\"$ .

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

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Product of a sum and a difference: $\"\"$ .

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$\"\"$ (Substitute $\"\"$ )

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

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

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Product of a sum and a difference: $\"\"$ .

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$\"\"$ (Substitute $\"\"$ )

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

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

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Horizontal method:

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Rewrite as the sum of two products.

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$\"\"$

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Apply distributive property: $\"\"$ .

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$\"\"$

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$\"\"$ (Powers of product property: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ ) $\"\"$

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Apply distributive property: $\"\"$ .

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$\"\"$

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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

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The product of $\"\"$ $\"\"$ . $\"\"$

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The product of $\"\"$ $\"\"$ .