How to find a Riemann sum using LEFT ENDPOINTS (KristaKingMath)

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Riemann sums are one method you can use to approximate the area under a curve, or approximate the integral. Instead of evaluating the integral directly, which we may not know how to do, we can instead divide the area into a set of rectangles, and then find the area of each rectangle, summing the areas together at the end to get an approximation of total area.

When you calculate the area using a Riemann sum, you can use the left endpoints of the rectangles, the right endpoints of the rectangles, or the midpoints of the rectangles. In this example, we'll use left endpoints.

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