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OpenStudy (anonymous):
Find the exact location of all the relative and absolute extrema of the function. (Order your answers from smallest to largest x.) f(x) = 25sqr(x)*(x − 1); x ≥ 0 I found that f has relative maximum at (x, y) = (0,0) but can't figure the absolute minimum
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OpenStudy (ranga):
\[f(x) = 25\sqrt{x}(x-1)~~or~~25\sqrt{x(x-1)}~~~?\]
OpenStudy (anonymous):
the first one
OpenStudy (ranga):
\[f'(x) = \frac{ 3x-1 }{ 2\sqrt{x} }\]
OpenStudy (ranga):
f'(x) = 0 when x = 1/3. Relative minimum at x = 1/3 f(1/3) = 25 * 1/ sqrt(3) * (-2/3) = -50/9 * sqrt(3). This is also the absolute minimum.
OpenStudy (ranga):
x = 0 is the left end point of the domain of this function and f'(0) is not zero. Such points are usually not considered as a relative extrema.
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