Thread:John Lee Gamma Guild Team Vi Hart/@comment-25079450-20150906050807

Sooo.... I was doing Evaluate composite functions from formulas on Khan Academy. I got to a question and I had to find sqrt(9). I got confused so I looked it up on Google and it said the answer to that was 3. Shouldn't the answer be either 3 or -3 because 3^2 = 9 and (-3)^2=9? 