Okay, so I'm having trouble with subbing in (-)infinity...
a) lim x -> -inf. 1/x^3
Then consider this...:
b) lim x-> -inf. -1/x^3
= 1/inf. <--- 1) Do the (-)s cancel eachother out here?
Now let's say this was part of a bigger eqn such that the eqn looked like:
lim x-> -inf. of f(x)=(x^3)-1/(x^3)
2) Would I have added the zero in my b example, taken it away,
3) Or furthermore, would it be a 0- or 0+?
4) Does it matter since it's a zero and therefore it wouldn't affect the result?