Describe the x-values at which f is differentiable please help!?

Question

f(x) = (x + 1)^(2/3)

Answer 1

The derivative is"

(2/3)(X + 1)^(-1/3)

or

(2/3)(1 / (X + 1)^(1/3))

The derivative will be undefined where the denominator of the fraction is zero. So it's undifferentiable when X = -1

Answer 2

f(x) is continuous for all reals.
dy/dx is discontinuous at x = -1, although f(x) has a minimum value of 0 at x = -1.