Quote Originally Posted by Jessweeee♪ View Post
It's mistakes like these that's making me fail my math course! I know what I'm doing, but I just put something stupid like a minus sign where a plus should be
Those mistakes will kill you in your future courses, especially Calc level classes, where the minus sign will give you a completely different answer. You should always check your work twice before you hand something in.

Actually, it'll start killing you once you get to polynomials and graphs, too.