http://i132.photobucket.com/albums/q...159/ET24-4.jpg

Here's my problem. Here's what I tried:

whenever

The graph tells me that when

What I'm not completely sure about is what to do from here.

I think delta is 0.7, but I'm not sure how to conclude that mathematically.

Is this problem asking to find the smallest value of delta that the limit of f(x) at x is less then 0.6 away from 3?