1. The problem statement, all variables and given/known data So its log(base2)(1-2x) 2. Relevant equations 3. The attempt at a solution I understand that derivative of log(base:a)x equals 1/xlna. However, using (1-2x) for x and 2 for a I got 1/(1-2x)ln2. Of course, i have to use the chain rule, which turns out to be -2. So my final answer is -2/(1-2x)ln2. However, it seems like that is incorrect. please help me.