If x and y are real and different. u = x2 + y2 + 9z2 – 6xyz -3zx – 2xy . Then u is always non negative zero non positive

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If x and y are real and different. u = x2 + y2 + 9z2 – 6xyz -3zx – 2xy . Then u is always non negative zero non positive

If x and y are real and different.
u = x2 + y2 + 9z2 – 6xyz -3zx – 2xy
. Then u is always

non negative

zero

non positive

1 Answers

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If x and y are real and different. u = x2 + y2 + 9z2 – 6xyz -3zx – 2xy . Then u is always non negative zero non positive

If x and y are real and different.u = x2 + y2 + 9z2 – 6xyz -3zx – 2xy. Then u is always non negative zero non positive

1 Answers

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If x and y are real and different.
u = x2 + y2 + 9z2 – 6xyz -3zx – 2xy
. Then u is always

non negative

zero

non positive