Răspuns:
Explicație pas cu pas:
x+1=0 x>-1
x²-5x-14=0 x1,2=5±√25+56/2=5±9/2 x1=7 x2=-2
x.....................-2.......-1...0...............7..........................∞
x+1 --------------------0+++++++++++++++++++++++++++
-x²+5x+14----0++++++++++++++0------------------------
E-----------------I+++++0--------------I+++++++++++++++++++
E(x)≥0 pentru x∈(-2,-1] I=(-∞,7)
E(x)<0 pentru x∈(-∞,-2)∪(-1,7)
