(x-2)(x+4)-(x+2)(x+3)=0
(x2+4x-2x-8)-(x2+3x+2x+6)=0
X2+4x-2x-8-x2-3x-2x-6=0
-3x-14=0
-3x =14
x= -14 Phần 3
Vậy ......
(x - 2)(x + 4) - (x + 2)(x + 3) = 0
<=> x2 + 4x - 2x - 8 - ( x2 + 3x +2x +6) = 0
<=> x2 + 2x - 8 - x2 - 5x - 6 = 0
<=> - 3x = 6 + 8
hay -3x = 14
=> x = \(\frac{14}{-3}\)= \(\frac{-14}{3}\)
Vậy x = \(\frac{-14}{3}\) thì phương trình bằng 0