Consider the function f(x) = 1.984x4 - 7.936x³ a. Locate the critical inputs on the interval [2.8, 5.09]. Show some work to support your answer. b. Determine the absolute maximum and absolute minimum values (this means y-coordinates) for f(x) on [-2.8, 5.09]. Round your answers to two decimal places. c. Is there a critical input which is neither a local maximum nor a local minimum? If yes, identify the input and explain why it is neither a local max nor a local min.

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