88.
from here
90.
that is real solution, but we also have two complex solutions
92.
x^6+64*i=0
x^6= -64*i
For z^n=a the solutions are :
k=0,1,..... ,n-1
for n=6, a=-64i
substituting values for a, n, and k you will get following complex solutions:
94. doing this one using same method as in 92, solutions will be
