Question

I’ve done this over and over how do u do it?

Answer 1

Long division would take care of this nicely for you.  In the box you will put this:$5 x^{4}+0 x^{3} +3 x^{2} +0x+8$.  Don't forget to leave a place for the x's that aren't there.  Then do the division.  The answer is A.  I believe that it would be near impossible to show you how to do long division of polynomials in this particular forum.