For each function, determine the equation for the vertical asymptote:

$\displaystyle \frac{{{x}^{{3}}+{1}}}{{{3}{x}+{6}}}$ has Select an answer x=-2 x=2 x=-3

$\displaystyle \frac{{{x}+{1}}}{{{2}{x}-{4}}}$ has Select an answer x=-2 x=2 x=-3

$\displaystyle \frac{{{x}+{2}}}{{{3}{x}+{9}}}$ has Select an answer x=-2 x=2 x=-3