\"\"

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The expression is \"\".

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Square of sum:  \"\".

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\"\"     (Substitute \"\")

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\"\"        (Evaluate powers:  \"\")

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

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\"\"                (Multiply: \"\")

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

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Horizontal method:

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Rewrite as the sum of three 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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\"\"            (Powers of product property: \"\")\"\"

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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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\"\" (Group like terms)

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\"\"                    (Add: \"\")

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

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The product of  \"\"\"\" .\"\"

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The product of  \"\"\"\" .