If x^2=x-2, then x^3=?
Pick one.
A) 3x+2
B) 3x-2
C) 2x+1
D) -x-2
E) 3x+4
Given X^2 = X-2   X^3 = X*X^2 = x*(X-2)-- Substituted from above.   = X^2 - 2X = X-2-2X = -X-2.   Hence -x-2.
<result>D</result>
If x^2=x-2, then x^3=?