find all the value of arccosh^-1(5throot(-18)) express in form of x+jy

Question

plz show me how

Answer 1

I'll let wolframalpha do it:

http://www.wolframalpha.com/input/?i=arccosh(-18%5E(1%2F5))

Recall that arccosh(x) = ln(z + sqrt(z^2-1))