We find the derivative: f '(x) = 6x + 4. This is never undefined, and is zero when , so this is our only critical point. In order to have a point to graph, we also need to know the y-value. We plug back into the function: The exact point on the function is . For the sake of graphing, it's useful to know that so we know where to put the dot: Be Careful: When graphing, label points with their exact coordinates. The only reason to find approximate values is so you know where to draw the point. |