x, y and z are real numbers. If and , then what is the value of ? . .
| x, y and z are real numbers. If
and
, then what is the value of
?



A. –1
B. 1
C. 3
D. –3
Right Answer is: D
SOLUTION
.
.
.
.
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x, y and z are real numbers. If and , then what is the value of ? . .