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Calculati (fof)(1) pentru care functia f:R=R, f(x)=3x+1

Răspuns :

f(f(x)) = 3(3x+1) +1 = 9x + 4 care pt x=1 da f(f(1)) = 9+4 =13
f(1)=3*1+1=4
f(4) =3*4+1=13
as simple as that!!

altfel , mai jmeker
f(f(x)) = 3(3x+1)+1=9x+4
f(f(1))=9*1+4=13