http://img34.imageshack.us/img34/198...s123523456.jpg
I'm trying to work through some examples, but im not sure where the following comes from:
1. circled in black -- how do i get the δ<1?
2. circled in red -- how do I get 0<x<2, i.e. x∈(0,2)?
3. cirlced in blue -- how do i get |x^2+x+3|<9
Thanks, most appreciated.