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 - 6 y z - 3 z x - 2 x y 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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