[QUOTE=Moo;327307]Hello,
-81=(-1)*(81)
The 4th root of 81 is 3 (because 81=9x9=3x3x3x3)
Now, what is the 4th root of -1 ? Write , where k is an integer
And then take the fourth root of
Typo: This should be either or
: (k=0,1,2,3) then as k grows up, you'll get back to these solutions...