Question

Sa se afle ex 1 4 6 9

Answer 1

Stii ca (f compus g)(x)=f(g(x))
1. (f compus f)(-1)=f(f(-1))=f(-1)=-1
   (g compus g)(1)=g(g(1))=g(-1)=-5
  (f compus g)(0)=f(g(0))=f(-3)=5
Si la fel si celelalte.
4. g(f(x))-x=g(5x-1)-x=(5x-1+1)/5-x=x-x=0
ecuatia: f(f(x))=f(5x-1)=5(5x-1)=25x-6 deci 25x-6=20 x patrat-1
20 x patrat- 25 x+5=0 
4x patrat-5x+1=0
delta=9
deci x_1=1 si x_2=1/4