Question: In Exercises 78 through 81, use a graphing utility to sketch the graph of f(x). Then find f'(x) and graph it on the same axes

In Exercises 78 through 81, use a graphing utility to sketch the graph of f(x). Then find f'(x) and graph it on the same axes (screen) as f(x). Finally, use TRACE, ZOOM, or the ZERO command to find the values of x where f'(x) = 0.

f(x) = x5 − 7.6x3 + 2.1x2 − 5

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