$x=-\frac{\sqrt{5Y+225}}{10}+\frac{1}{2}$
$x=\frac{\sqrt{5Y+225}}{10}+\frac{1}{2}$

$Y=20\left(x-2\right)\left(x+1\right)$

$x=-\frac{\sqrt{5Y+225}}{10}+\frac{1}{2}$
$x=\frac{\sqrt{5Y+225}}{10}+\frac{1}{2}\text{, }Y\geq -45$