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Question

Find the following product:
(x21)(x4+x2+1)

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Solution

Identitity to be used : (a3b3)=(ab)(a2+ab+b2)
Consider given product
(x21)(x4+x2+1)
=(x21)((x2)2+x2(1)+12)
=((x2)313)
=x61

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