Can someone explain to me when the function f(x)=5x^(2/3)/x^2-x-20 is non-differentiable?

I believe it to be x=-4,x-5,and x=0 but I want to ensure I am correct. Thank You!

Sqdancefan2015-07-05T12:26:56Z

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x = {-4, 0, 5} is correct.

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