This is very unusual language, possibly specific to your text book or instructor. Try to add better explanations of what you are doing. Not everyone uses the same terminolgy. For example, "infinte number" really is not a meaningful term. It is very, very poorly defined.

Expand the numerator.1.) (H+1)^3 - H^3 / H^2 - 3H

H^3 + 3H^2 + 3H + 1 - H^3 = 3H^2 + 3H + 1

Now that we have , I'm going to guess the answer is 3.

The second is similar. Expand the numerator and see what happens.