Use a graphing calculator to find the location of all relative extrema (to three decimal places).f(x) = x4 - 3x3 - 21x2 + 74x + 47
A. Relative maximum at x = 1.526; Relative minima at x = -3.02 and x = 3.775
B. Relative maximum at x = 1.644; Relative minima at x = -3.127 and x = 3.663
C. Relative maximum at x = 1.623; Relative minima at x = -3.15 and x = 3.71
D. Relative maximum at x = 1.604; Relative minima at x = -3.089 and x = 3.735
Answer: D
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