Expand using identities (x+2y+4z)^2

1.	Expand using identities (x+2y+4z)^2
Answer» (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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