If f(x) = (7x + 8)(6x - 5), find f '(x) and f ''(x).
hi,
1. rearrange and use product rule:
2. Don't expand the brackets.
3. Do yourself and do us a favour: If you have a new question start a new thread because nobody will notice "from outside this thread" that you have an other problem to solve.
Last edited by earboth; October 2nd 2007 at 06:24 AM.