IF you have not get to imaginary numbers, your teacher is probably going to tell you : You can't take a square root of a negative number, therefore, there isn't an answer. BUT If you have learned or about to learn imaginary numbers, there is an "imaginary answer" to the question. As I learned in pre-calculus, i= √-1 ( square root of negative one) therefore is the answer could be simplfy as "" √2*i "" or "" i√2 "