Ok, I worked this derivative problem, but my book has a different answer than what I got. I'm not sure why. I need to compute the derivative of log base3 of (x^3 + 2x) I came out with: 1/((x^3 + 2x)ln3) The book says that the answer is the same as mine except the numerator has a (3x^2 + 2) in it. Why would you put the derivative of the x value of the log function in the numerator. My book says that D log base a of x = 1/xlna help?