1.

Expand using suitable identities : (x + 2y + 4z)2

Answer»

(x + 2y + 4z)2 

= (x)2 + (2y)2 + (4z)2 + 2(x) (2y) + 2 (2y) (4z) + 2 (4z) (x) 

[ ∵ (x + y + z)2 = x2 + y2 + z2 + 2xy + 2yz + 2zx] 

= x2 + 4y2 + 16z2 + 4xy + 16yz + 8zx



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