x(x+2)(x-3)<0
x=0
x+2=0 => x=-2
x-3=0 => x=3
Asezi pe o axa numerele:
................-2.................0...................3.............
x=0 ------------------------------0++++++++++
x+2 --------------0+++++++++++++++++++++++
x-3--------------------------------------------------0+++++++++
x(x+2)(x-3) -----0++++++++0-----------------0++++++++++
Deci x(x+2)(x-3)<0 pentru x apartine (-oo -2)reunit (0, +oo)
asa le faci si pe restul