Question

se considera functia f :R->R,f(x)=ax+b.Sa se determine numerele reale a si b stiind ca 3f(x)+2=3x+5

Answer 1

$3(ax+b)+2=3x+5 =\ \textgreater \ 3ax+3b+2= 3x+5$ 
apoi $3ax=3 =\ \textgreater \ a=1$
$3b+2=5 =\ \textgreater \ 3b=3 =\ \textgreater \ b=1$ deci functia noastra este f(x)=x+1