# Pls solve and answer the question in detail. Q. If x, y and z are real then the possible value of the expression ${x}^{2}+4{y}^{2}+9{z}^{2}-6yz-3zx-2xy$ may be. (A) Non negative (B) negative (C) zero (D) Any real no.

Hi,
let it is equal to u and then

so option a

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