x, y and z are real numbers. If x3 + y3 + z3 = 13, x + y + z = 1 and x – McqOptions

MCQOPTIONS

1.	x, y and z are real numbers. If x3 + y3 + z3 = 13, x + y + z = 1 and xyz = 1, then what is the value of xy + yz + zx?
A.	1
B.	-1
C.	3
D.	-3
Answer» E.

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