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Question

Expand the following, using suitable identities: (x+2y+4z)2

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Solution

(x+2y+4z)2
Here a = x, b = 2y and x = 4z
= x2 + (2y)2 + (4z)2 + 2x(2y) + 2(2y)(4z) + 2(4z)x
= x2 + 4y2 + 16z2 + 4xy + 16yz + 8zx


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