Math Help - Simple basic function end behavior model

I could use some help with this problem:

For the function y=e^x - 2x^3 +15x find:
(a) A simple basic function right end behavior model
(b) A simple basic function left end behavior model

Not exactly sure how to do this.
My answer:
(a) = e^x
(b) = -2x^3 + 15x

Is this correct?
Thanks.

I like it.