Intervals of Increase and Decrease – Put to Bed!

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Ever since I wrote Common Core Algebra I, I’ve had numerous discussions with math teachers around the country who weighed in on the subject of intervals of increase and decrease of functions. In my answer key, I often include the x-coordinates of the turning points in the intervals, although I’m not entirely consistent on it. Now, I’ve had folks email me clearly upset that I’ve included the x-values of turning points in the intervals. Their… Read more »