X^2-4x-12 -------------- <0<br> x-2 x^2-4x-12=0 ---> x1=-2, x2=6 (x+2)(x-6) --------------- <0<br> x-2 - - - - - (-2)+ + + + +(2)- - - - -(6)+ + + + x Є (-беск,-2)U(2,6)