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Question

Question 85 (viii)

Expand the following, using suitable identities.

(4x5+y4)(4x5+3y4)


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Solution

We have,
(4x5+y4)(4x5+3y4)=(4x5)2+(y4+3y4)4x5+y4×3y4 [using the identity, (x+a)(x+b)=x2+(a+b)x+ab]
=1625x2+4xy5+3y216


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