Expand using identities (x+2y+4z)^2
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Yogita Ingle 4 years, 3 months ago
(x+2y)+4z)2=
= (x+2y)2+z2+2(x+2y)z
= x2+4y2+4xy+z2+(2x+4y)z
= x2+4y2+z2+4xy+2xz+4yz
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