Oblicz sumę pierwiastków równania (xkwadrat-4)(2x-6)(x-3)=0 daje naj ! :(

(x²-4)(2x-6)(x-3) =0 (x-2 ) (x+2) = 0    i   2x-6 =0     i   x-3 = 0 (x-2) (x+2) = 0 x-2 = 0 x= 2 x+2 = 0 x= -2 2x-6 = 0 2x= 6 x= 3 x-3=0 x= 3 suma pierwiastków 2+ (-2) + 3+3 = 6