If x^2=2x+1, then x^3= ? Choose the correct choice from the following answers.
A) 5x+2	B) 3x-2	C) 2x+1	D) 4x-3	E) 3x+4
x^2 = 2x+1   x^3 = x*x^2 = x*(2x+1) = 2x^2 + x = 2(2x+1)+x = 5x+2   The answer is 5x+2.
<result>A</result>
If x^2=2x+1, then x^3= ?