(2x-9)(x+6)-x (x+6)=0

Question

(2x-9)(x+6)-x (x+6)=0

Answer 1

2x²+12x-9x-54-x²-6x=0
x²-3x-54=0
D=b²-4ac=9-4*(-54)=9+216=225
√D=√225=15
-b±√D/2a x1=3+15/2=9 x2=3-15/2=-6
x1=9 x2=-6