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OpenStudy (anonymous):
The graph of f(x) = 12(x-9)-(x-9)^3 has a horizontal tangent at the point(s)...
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OpenStudy (anonymous):
Horizontal tangent means when the tangent is 0. Therefore we have to find the derivative of f(x) f(x) = 12x - 108 - (x-9)^3 f'(x) = 12 -3(x-9)^2 Equate to 0 and find x
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