What should be added to 7x²+18xy+z²-7 to get x²+10xy-2z²+1 – InterviewSolution

1.

What should be added to 7x²+18xy+z²-7 to get x²+10xy-2z²+1

Answer»

$8x {}^{2} + 28xy - z {}^{2} - 6$

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