Expand (x+2y+4z)^2 using suitable identities plz help me – InterviewSolution

1.

Expand (x+2y+4z)^2 using suitable identities plz help me

Answer»

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$(x+2y+4z) {^2}$

$x{^2}+4y{^2}+16z{^2}+2(x)(2y) +2(2y) (4z) +2(4z) (x)$

$x{^2}+4y{^2}+16z{^2}+4xy+16yz+8zx$

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