I added a second movable point in the second graph. This point is point f(b), it moves along the parabola in the same way f(a) does. The set up for my own graph wasn't too different than the original two, the only thing I changed was the f(x) equation. I took my creativity to the max. Using limits, we can use a secant line and eventually turn it into a tangent line.
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January 2018
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