Răspuns:
x ∈ (-2 ; 0)
Explicație pas cu pas:
x(x+2)<0
x = 0 ; x+2 = 0 => x = -2
x I -∞ -2 0 +∞
__________________________________
x I---------------------------------0++++++++++++
x+2 I----------------------0+++++++++++++++++++
x(x+2) I+++++++++++++0---------0++++++++++++
=> x ∈ (-2 ; 0)