There are four different fourth roots of 16. That is, there are four complex numbers that can go in the black square in the equation below:Find them.
■4 = 16
See this:
https://web2.0calc.com/questions/help-pls_68
x4 =16
x2 = +-4
x = +- sqrt (+4) and +- sqrt(-4)
= +-2 and +- 2i
+18 
+36916 
