[SOLVED] how do you find derivative equations? I'm not sure if this is the right sub forum. 1. The problem statement, all variables and given/known data f(x) = x^3 +6X^2 + 9x + 4 2. Relevant equations 3. The attempt at a solution in my book, the first derrivative equation is 3x^2 + 12x + 9 and second equation as 6x + 12 how do you get to these equations? I know how to calculate the difference........ I'm guessing somehow that's how you get it. I'm not even sure if my question makes sense. I'm working ahead of class, so there's alot of gaps I need to fill in.