The horizontal asymptotes of the curve $$y= \frac{5 x}{(x^4 +1)^{\frac{1}{4}}}$$ are given by
$y_1$ =
$y_2$ =

where $y_1 > y_2$.

The vertical asymptote of the curve $$y=\frac{-6 x^3}{x +2}$$ is given by $x=$