If x + y + z = 13 and x2 + y2 + z2 = 69, then xy + z (x + y) is equalto

If x + y + z = 13 and x2 + y2 + z2 = 69, then xy + z (x + y) is equalt

1.	If x + y + z = 13 and x² + y² + z² = 69, then xy + z (x + y) is equal to
A.	70
B.	40
C.	50
D.	60
Answer» D. 60

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If x + y + z = 13 and x2 + y2 + z2 = 69, then xy + z (x + y) is equalto

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If x + y + z = 13 and x² + y² + z² = 69, then xy + z (x + y) is equal
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