Can anyone help me please.

2. (a) Explain in your own words what it means for a function f : R - R to [5] be k-times continuously differentiable (or CK) at a point Xo E R. (b) Consider the function f : R - R, where [5] f (x ) =3 z(x + 1)2 if x 1. Is it Ck for all k > 1 [10] everywhere else? Explain your