(2x
2 – 4)(3x-3) = (3x-3)x
2
(2x
2 – 4)(3x-3) = (3x-3)x
2 / -(3x-3)x
2
(2x
2 – 4)(3x-3) -(3x-3)x
2 = 0
(3x-3)[(2x
2 – 4) -x
2] = 0
(3x-3) (2x
2 – 4 -x
2) = 0
(3x-3) (x
2 – 4 ) = 0
3(x-1) (x – 2) (x + 2) = 0 /:3
(x-1) (x – 2) (x + 2) = 0
-
(x-1) = 0
x-1 = 0 /+1
x = 1
-
(x – 2) = 0
x – 2 = 0 / +2
x = 2
-
(x + 2) = 0
x +2 = 0 / - 2
x = – 2