x^4+5x^3

_______
3x^2

How would I do this? I can't seem to figure out how to set this problem up.

just divide each term in the numerator by the denominator:

(x^4+5x^3)/(3x^2) = x^4/(3x^2) + 5x^3/(3x^2) = x^2/3 + 5x/3

or,

1/3 x^2 + 5/3 x