Easy question

[boggiano]

(09-09-2021 10:10 PM)toml_12953 Wrote:  

(09-09-2021 06:05 PM)boggiano Wrote:  Sorry John, but I don't get it.

\((x+1)^{\frac{4}{5}}\)

with X=-2 I get an irrational number.

Instead, if I use the " classic notation" (sqrt function + power) I get the right result: 1.
I would like to continue to use this notation (it is faster to insert)

I don't see how you get an irrational number. Here's a screenshot:

And here the mine:
(Sorry, I don't know how to take a screenshot!)