Question
Expand following, using suitable identities :- (x + 2y + 4z)2
Solution
It is known that,
(x + y + z)2 = x2 + y2 + z2 + 2xy + 2yz + 2zx
(x + 2y + 4z)2 = x2 + (2y)2 + (4z)2 + 2(x)(2y) + 2(2y)(4z) + 2(4z)(x)
= x2 + 4y2 + 16z2 + 4xy + 16yz + 8xz
Is there an error in this question or solution?
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Expand following, using suitable identities :- (x + 2y + 4z)^2 Concept: Algebraic Identities.
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