Extrema, Critical Points and Second Partials Test
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Extrema & Critical Points. Need only circled questions.
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fx = 2x + 6y, fy = 6x + 20y - 4, fxx = 2, fyy = 20, fxy = 6
Critical points are obtained when fx = 0, fy = 0
2x + 6y = 0 y = -x/3
6x + 20y = 4 ...
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