Simplify the rational expression [math]\frac{5}{x^2}+\frac{3}{x}+\frac{1}{4x}[/math].
[list=1] [*]Identify any invalid values of the expression. [*]Find a common denominator. [*]Rewrite each term of the expression using the new denominator. [*]Check to see if the result can be written in a simpler form. [/list]