# Math Help - Question about differentiables

I am trying find were X is not differentiable when f(x)=x^1/3.

2. Originally Posted by Mortifix
I am trying find were X is not differentiable when f(x)=x^1/3.
I'm not sure what you mean. This f(x) is differentiable for all real numbers x.

-Dan

3. Well its a muliple choice, and my options are:

a. Not differentiable for negative values of X.
b. Not differentiable for X E (-1, 1)
c. Not differentiable for x=1 and x=-1
d. Not differentiable for x=0

4. It is not differenciable at zero.