Missing one root

[rrpalma]

Hello,

I'm going over some simple math problems on both my HP50G and my Prime.

When I try to solve the very simple equation

(x-3)^(2/3) = 4

The HP50G correctly provides 11 and -5 as answers within a list

However the Prime only finds 11 as root, also within a list.

What gives?

Thanks for reading.