The function f(x) = 2x³ - 42x² + 240x + 7 has one local minimum and one local maximum. Use a graph of the function to estimate

Question

The function f(x) = 2x³ - 42x² + 240x + 7 has one local minimum and one local maximum.
Use a graph of the function to estimate these local extrema.
This function has a local minimum at x = with output value and a local maximum at x = with output value

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