1. The problem statement, all variables and given/known data For a real number x, √√(-x) equals : a) +x b) -x c) complex d) pure imaginary 2. Relevant equations √-1 = i 3. The attempt at a solution Here is what i did: If x is a positive real number then the answer comes out to be x^0.25 * √i (now what is square root of i equal to?) But if x is a negative real number then the solution would be : x^0.25 I don't know what to do next, any help would be appreciated.