Use a graphing calculator to find the approximate location of all relative extrema.f(x) = x4 - 4x3 - 53x2 - 86x + 72
A. Relative maximum at x = 0.894; relative minima at x = -3.193 and x = 7.212
B. Relative maximum at x = 0.923; relative minima at x = -3.161 and x = 7.046
C. Relative maximum at x = -0.944; relative minima at x = -3.192 and x = 7.136
D. Relative maximum at x = 0.957; relative minima at x = -3.114 and x = 7.213
Answer: C
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