T³(t-3)-t²(t-3)-17t(t-3)-15(t-3)<0<br>(t-3)(t³-t²-17t-15)<0<br>(t-3)[t²(t+3)-4t(t+3)-5(t+3)]<0<br>(t-3)(t+3)(t²-4t-5)<0<br>(t-3)(t+3)[t(t+1)-5(t+1)]<0<br>(t-3)(t+3)(t+1)(t-5)<0<br>t=3 t=-3 t=-1 t=5
+ _ + _ +
----------(-3)------------(-1)-----------(3)--------------(5)-----------------
t∈(-3;-1) U (3;5)