Question: Find f'(x) and approximate (to four decimal places) the value(s) of x where the graph of f has a horizontal tangent line. f(x) = 0.13x4


Find f'(x) and approximate (to four decimal places) the value(s) of x where the graph of f has a horizontal tangent line. f(x) = 0.13x4 + 0.7x3 5.6x2 - 22.3x +1 f' (x) = D
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