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Question

Find the product:
(9x2 − x + 15) × (x2 − x − 1)

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Solution

By horizontal method:

(9x2-x+15)×(x2-x-1)=x2(9x2-x+15)-x(9x2-x+15)-1(9x2-x+15)=9x4-x3+15x2-9x3+x2-15x-9x2+x-15=9x4-10x3+7x2-14x-15

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