Question

Fie f:R-R, f(x)=2008x-2007. Verificati dacă: A(2009 supra 2008; 2) € Gf

Answer 1

A € Gf daca f(2009/2008)=2
f(2009/2008)=2008·2009/2008-2007
f(2009/2008)=2009-2007
f(2009/2008)=2
2=2, deci A € Gf

Answer 2

$A(\frac{2009}{2008};2) \ \in G_f \ (1)\ \ =\ \textgreater \ f(\frac{2009}{2008})=2 \\\\\\ f(\frac{2009}{2008})=\not 2008* \frac{2009}{\not 2008}-2007 \\\\ f(\frac{2009}{2008})=2009-2007 \\\\ f(\frac{2009}{2008})=2 \\\\ \Longrightarrow (1) \ \ ''A''$