solve the problems below (correct answer please)

2. (a) Define, and carefully explain in your own words, what it means for [5] a function f : R - R to be differentiable at a point Xo E . (b) Plot the function f : R - R in a graph, where (10] f (x ) = |x -1| if x 5 2. if x > 2. (Recall |z) = z if z 2 0 and |z| = -z if z