solve for x
(x+1)(x-3)=0
x = 1, x = 3
x = 1, x = - 3
x = -1, x = - 3
x = -1, x = 3
(x+1)(x-3)=0
x = 1, x = 3
x = 1, x = - 3
x = -1, x = - 3
x = -1, x = 3