Math Help !! Need help with 2 problems concerning limits as X approaches infinity. ?

I have zero idea how to solve these 2, please explain if possible.Thanks for your help.

lim x^3 – x^2 over x^4
x >0
Is it approaching the limit from the positive or negative direction?

and this one...

lim x^3 – x^2 over x^4
x >0
Is it approaching the limit from the positive or negative direction?