Which are the solutions of the quadratic equation x^2=9x+6?

First you subtract x² on both sides to get:

0 = 9x + 6 - x² or -x² + 9x + 6 = 0 ------> (ax² + bx + c)

a = -1

b = 9

c = 6

The quadratic formula is:

x =

Now you plug it in.

The answer should be the third one