Respuesta :

a. x(x - 6)= 0; x = 0; x = 6
b. (x - 7)(x +7)=0; x = 7, x =-7
c. x(x + 3)= 0; x= 0, x = -3
d. -2x(x - 3)= 0; -2x =0; x = 0, x = 3