a) Abscissae = fancy word for x-value
Stationary points occur when dy/dx = o
x = -1, 2 and 3
b) Draw a table and have x = 2-, x = 2 and x = 2+ on the top row
Bottom row sub in the numbers and write down the values you get
2- means just a bit smaller than 2 so use 1.999
2+ means just a bit...