It appears that you reversed the two functions when setting up the division problem. Start with $\displaystyle\frac{{f{{\left({x}\right)}}}}{{g{{\left({x}\right)}}}}=\frac{{{9}{x}+{3}}}{{{3}{x}+{1}}}\usepackage{cmbright}\Huge\$ . Then factor the numerator and denominator, if possible. The correct answer is 3.