- positive (- 2,0) U (0, 2), negative (- infinity, -2) U (2, + infinity)
- when f '(x) is positive f (x) is increasing, and when f ' (x) is negative f (x) is decreasing.
2.
- local max at about x=+1.10, - 1.10, local min at x=0
- locals are when there is a change in slope, tha point where it changes is the local
3.
- up at (- infinity, -1.10) U ( 0, 1.10), down (-1.10, 0) U ( 1.10, + infinity)
- it is up when it curves to look like a upside down "U", and its down when it curves to look like a "U"
4. f ' (x)= x^4 b/c the slope is moves/changes 3 times
