Question

find the square root x²+4y²+4z²-4xy+8yz-4xz
and choose the option
(i)(x-2y-2z)²(ii)(–x+2y+2z)² (iii)both(i)and(ii) (iv)noneofthese​

Answer 1

Answer:

(x + 2y + 4z)²

= x² + (2y)² + (4z)²² + (2×x×2y) + (2×2y×4z) + (2×4z×x)

= x² + 4y² + 16z²+ 4xy + 16yz + 8xz