Question

$$Y(X+Y)/ { X }^{ 2 } - { Y }^{ 2 } -X/X-Y$$

Evaluate

$-Y^{2}-Y+\left(\frac{Y}{X}\right)^{2}+\frac{Y}{X}-1$

Expand

$-Y^{2}-Y+\left(\frac{Y}{X}\right)^{2}+\frac{Y}{X}-1$