Split it into two different integrals..
EDIT: LaTeX fixed.
I tried my very best to solve this but I am stuck. I really dislike my text book at all and my professor is very hard for me to understand. Does anyone have a good resource online for this type of problem? I understand all the new concepts we are supposed to be learning but I am stuck on the stuff I was supposed to learn last semester e.g. 5 years ago for me.
your answer made this problem trivial - even to me haha. Weird thing is when I attempted to verify the derivative of e^(-x), I used google's first search result Online Derivative Calculator
Which says that
Function e^(-x)
f'x = -log(e)/e^x
pretty weird...