(i) Expand (x + 2y + 4z)2
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Step-by-step explanation:
using ( a+b+c)²= a²+b²+c²+2ab+2bc+2ac
=(x)²+2y²+4z²+2×x×2y+2×2y×4z+2×4z×x
=x²+4y²+16z²+4xy+16zy+8xz
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