1. The problem statement, all variables and given/known data There are two ways to write the momentum operator, p = (-i hbar d/dx) and p = (hbar / i)d/dx. How do you go from one to the other? 2. Relevant equations The two I gave above. 3. The attempt at a solution I tried to see if -ih = h/i by squaring both sides, but one came out positive and the other negative. Thanks for the help!