1. ## simplest form

express in simplest form
x - 4/x
-------
2 + x
------
x

express in simplest form
x - 4/x
-------
2 + x
------
x

$\frac{x - \frac{4}{x}}{\frac{2+x}{x}}$

if so, multiply every term in the numerator and denominator by x ... then see what you can do.