The correct option is option (b) $\frac{-3}{2}, \frac{4}{3}$
$f(x)=x^{2}+\frac{1}{6} x-2=0$
$\Rightarrow 6 \mathrm{x}^{2}+\mathrm{x}-12=0$
$\Rightarrow 6 x^{2}+9 x-8 x-12=0$
$\Rightarrow 3 x(2 x+3)-4(2 x+3)=0$
$\Rightarrow(2 x+3)(3 x-4)=0$
$\therefore \mathrm{x}=\frac{-3}{2}$ or $\mathrm{x}=\frac{4}{3}$