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

Answers : (1)

Saurabh Koranglekar
askIITians Faculty
6005 Points
							Dear student

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Regards
one month ago
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