Divide as indicated.
(-2x^5 - x^3 + 4x^2 + 58x - 20) ÷ (x^2 - 5)
You will have to use algebraic long division, which is hard to show and explain in this format.
See this page
http://www.sosmath.com/algebra/factor/fac01/fac01.html
the example about 1/3 of the way down the page is similar to yours, I am talking about the one where they divide by x^2 + 3