(x+3)(x-4)<0<br>======-3=======4=======
++++++ ------------ =+++++
x=(-3 4)
x(x+2)(x-5)≥0
=========-2======0=======5=======
----------------- +++++ ------------ +++++++
x=(-2 0)U(5 +oo)
12x²-11x-1<0<br>D=121+48=169
x12=(11+-13)/24=1 -1/12
12(x-1)(x+1/2)<0<br>==========-1/2=======1========
++++++++++ -------------- ++++++
x=(-1/2 1)
(x-5)/(x+7)<0<br>=========-7=======5=========
+++++++++ ------------ +++++++
x=(-7 5)