If x + y + z = 9, xy + yz + zx40, find the value of x2 + y2 + Z2 – InterviewSolution

1.	If x + y + z = 9, xy + yz + zx40, find the value of x2 + y2 + Z2
Answer» (x+y+z)² = x²+y²+z²+ 2(xy+yz+zx) putting all the values we get => x²+y²+z²= 9²-2(40) = 81-80 = 1. answer.

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