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Question

Find the product:
(2x2 − 5y2) × (x2 + 3y2)

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Solution

By horizontal method:

(2x2-5y2)×(x2+3y2)=2x2(x2+3y2)-5y2(x2+3y2)=2x4+6x2y2-5x2y2-15y4=2x4+x2y2-15y4

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