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Question

Find the product:
(9x2 − x + 15) × (x2 − 3)

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Solution

By horizontal method:

(9x2-x+15)×(x2-3)=x2(9x2-x+15)-3(9x2-x+15)=9x4-x3+15x2-27x2+3x-45=9x4-x3-12x2+3x-45

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