Question

Solve x2 + 9x + 9 = 0

Answer 1

x^2 +9x +9 =0 

Discriminant = 81-36 = 45

x_1,2 = (-9 +/- sqrt45)/2 = (-9 +/- 3sqrt5)/2

x_1,2 = (-9 +/- 3sqrt5)/2

hope helped 

Answer 2

This equation can be solved using the quadratic equation. In this case, let A be 1, B be 9 and C be 9.
Apply the quadratic formula :

               -9 ± √ 45 
   x  =    —————
                    2

The two answers of this equation are:
1. x =(-9-√45)/2=(-9-3√ 5 )/2= -7.854 
2. x =(-9+√45)/2=(-9+3√ 5 )/2= -1.146