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Alexciu2003
a fost răspuns

f,g:R-R
f(x)=3x-2
g(x)=-x+4
a) fof,gog,fog,gof
b) calc: fof(2);gof(3);fog(-1)gog(-2)
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Răspuns :

Bogdanovici
a)(fοg)([tex] _{x} [/tex])=f(g([tex] _{x} [/tex])=f(-x+4)=-3x+10
(gog)=g(g(x))=g(-x+4)=x
(fof)=f(f(x))=f(3x-2)=9x-8
gof=g(f(x))=g(3x-2)=-3x+6

b)fof(2)=f(f(2))=f(4)=10
gof(3)=g(f(3))=g(7)=-3
fog(-1)=f(g(-1))=f(5)=13
gog(-2)=g(g(-2))=g(6)=-2

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