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phi
 5 months ago
Best ResponseYou've already chosen the best response.0Do you mean find the maximum or minimum value of y, defined by \[y=2x^28x+9 \]? if so, see http://www.khanacademy.org/math/differentialcalculus/derivative_applications/critical_points_graphing/v/identifyingminimaandmaximaforx312x5

phi
 5 months ago
Best ResponseYou've already chosen the best response.0or the introduction to the ideas: http://www.khanacademy.org/math/differentialcalculus/derivative_applications/critical_points_graphing/v/minimamaximaandcriticalpoints
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