Răspuns:
Explicație pas cu pas:
f(f(x))=f(x²-3x+2)=(x²-3x+2)²-3(x²-3x+2)+2
fie x²-3x+2=t
t²-3t+2=0
(t-1) (t-2) =0
t=1
x²-3x+2=1
x²-3x+1=0
x1,2=(3±√5)/2
t=2
x²-3x+2=2
x²-3x=0
x3=0
x4=3
