Does anyone know how to start or do this problem. I don't have an example in my book of it.
$\displaystyle \int_{-8}^ {6} f(x)= 2+e^x $
That is a nonsense problem. That is, it show the confusion of whom so ever wrote it
$\displaystyle \int_{-8}^ {6} f(x) $ is a definite integral, a number!
Whereas $\displaystyle 2+e^x $ is a function of x.
Are you sure that you have given all the information?