\(-2x+3=0\Leftrightarrow x=\dfrac{3}{2}\); \(x-2=0\Leftrightarrow x=2\); \(x+4=0\Leftrightarrow x=-4\). Ta có: TenAnh1 TenAnh1 B = (11.24, -6.26) B = (11.24, -6.26) B = (11.24, -6.26) C = (-0.38, -6.9) C = (-0.38, -6.9) C = (-0.38, -6.9) D = (14.98, -6.9) D = (14.98, -6.9) D = (14.98, -6.9) E = (-0.4, -6.68) E = (-0.4, -6.68) E = (-0.4, -6.68) F = (14.96, -6.68) F = (14.96, -6.68) F = (14.96, -6.68) Vậy \(f\left(x\right)=0\) khi \(x=\left\{-4;\dfrac{3}{2};2\right\}\). \(f\left(x\right)>0\) khi \(\left(-\infty:-4\right)\cup\left(\dfrac{3}{2};2\right)\). \(f\left(x\right)< 0\) khi \(\left(-4;\dfrac{3}{2}\right)\cup\left(2;+\infty\right)\).