This video shows how to find areas between curves. The basic idea is that we find the space trapped between two curves on a graph. The formula for finding this is top curve, subtract bottom curve and then integrate. The presenter shows a parabola that goes through the origin. Then he draws a line that runs through the origin. We try to find the area trapped between the two. You take your smallest x coordinate to the largest x coordinate, you take the curve on top (2x) and subtract the curve on the bottom (4x) and that's the interval you have to calculate.
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