# Thread: volume: figuring out integration values.

1. ## volume: figuring out integration values.

If i have the graph of the following functions y=ln7x,y=0 and x=5.

If I want to find the volume for x=-1, how would I figure out the values [a,b] of the integral. I know that this is a washer formula, but that is irrelevant.

What if I wanted to find the volume for y=5? What are the integration values now?

2. Ok well I checked my notes and for x=-1 the integral goes from 0 to ln35. I just do not see how that is.