If x^2=x+4, then x^3=?	Choices
A) 3x+2 B) 3x-2 C) 2x+1 D) 2x-3 E) 5x+4
Given X^2 = X+4   X^3 = X*X^2 = x*(X+4)-- Substituted from above.   = X^2 + 4X = X+4+4X = 5X+4.   Hence 5x+4.
<result>E</result>
If x^2=x+4, then x^3=?