Multiple Choice QuestionsIf 
and xyz = -1, then x3 + y3 + z3 is equal to:
-1
1
-2
2
B.
1
x + y + z = 1
(x + y + z)2 = x2 + y2 + z2 + 2(xy + yz + zx)
1 = x2 + y2 + z2 + 2(-1)
x2 + y2 + z2 = 1 + 2 = 3
x3 + y3 + z3 - 3xyz = (x + y + z) [x2 + y2 + z2 - (xy + yz + zx)]
x3 + y3 + z3 - 3(-1) = 1[3 -(-1)]
x3 + y3 + z3 + 3 = 3 + 1
∴ x3 + y3 + z3 = 4 - 3 = 1
If a(x + y) = b(x - y) = 2ab, the the value of 2(x2 + y2) is
2 (a2 - b2)
2(a2 + b2)
4(a2 - b2)
4(a2 + b2)
then the value of 
is
then the value of 
is
then the value of 
is:
Switch
is
then the value of 
then the value of x2 + 2x - 1 is
then the value of 
is:
