$$y=F(X)=3 { X }^{ 2 } -X-5$$
$X=\frac{\sqrt{12y+61}+1}{6}$
$X=\frac{-\sqrt{12y+61}+1}{6}$
$X=\frac{\sqrt{12y+61}+1}{6}$
$X=\frac{-\sqrt{12y+61}+1}{6}\text{, }y\geq -\frac{61}{12}$
$y=-\left(5+X-3X^{2}\right)$
