A pipeline is to be placed so that it connects point A to the river point B. A and B are two homesteads and X is the pumphouse. How far from M should X be so that the pipeline is as short as possible?
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Use a little Pythagoras on the two right triangles.
Let L=length of pipeline. Let x=length from M to X.
Differentiate, set to 0 and solve for x
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