1. The problem statement, all variables and given/known data Solve for z^4 +16=0 2. Relevant equations 3. The attempt at a solution What I first did was square rooted both sides to get z^2 = ±4i, but I don't how to continue from there. I'm guessing we have to find the roots from z^2=4i and then from z^2=-4i separately any help will be much appreciated!