$\"\"$

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The polynomial is $\"\"$ .

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

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Apply distributive property: $\"\"$ .

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$\"\"$

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

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$\"\"$ (Add: $\"\"$ )

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The value of $\"\"$ $\"\"$ . $\"\"$

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Vertical method:

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Multiply by 3.

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$\"\"$

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Multiply by 5a.

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$\"\"$

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$\"\"$

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Combine like terms.

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$\"\"$

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Thus, The value of $\"\"$ $\"\"$ . $\"\"$

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The value of $\"\"$ $\"\"$ .