How do I calculate roots with the 15c

[hatelove]

I'm trying to calculate the cube root of -8, for example, so I type in these buttons:

8
CHS (change sign)
Enter
3
1/x
y^x

But it gives me an error. What is the correct way to go about doing this?

 

[I like Serena]

You won't be able to calculate $\sqrt[3]{-8}$.
If you want it, calculate $-\sqrt[3]{8}$.

Calculators can't take roots of negative numbers.