If x+y+z=8 and x2+y2+z2=50, then the value of xy+yz+zx is
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(x+y+z)² = x² + y² + z² + 2 (xy+yz+zx)
64 = 50 + 2(xy+yz+zx)
xy + yz + zx = 14/2 = 7
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Answer:
7
Step-by-step explanation:
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