$T h e r a n g e o f x^{2} + 4 y^{2} + 9 z^{2} - 6 y z - 3 x z - 2 x y i s$

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Solution

The correct option is C
$x^{2} + 4 y^{2} + 9 z^{2} - 6 y z - 3 x z - 2 x y = (x)^{2} + (2 y)^{2} + (3 z)^{2} - (2 y) (3 z) - (x) (3 z) - (x) (2 y \geq 0 ∴ R a n g e = [0, \infty) .$

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