1. The problem statement, all variables and given/known data Determine whether or not the following pairs of operators commute...and there was one I could not solve...according to the back of the textbook, I do understand 14.c does NOT commute, but I don't understand... (14)c. A = SQR B = SQRT 2. Relevant equations ABf(x) - BAf(x) = 0 3. The attempt at a solution ABf(x) = A[f(x)]1/2 = f(x) BAf(x) = Bf2(x) = f(x)....so I thought they DO commute, but the textbook says NO! Could someone explain? Thanks!