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Consider the following function. f(x) = x4 – 16x3 + 72x2 + 6 (a) Make a sign diagram for the first derivative. ---Select--- A

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+ C) za 160 3+720²-6. -$(a) z 423 48?+1442 4a. (x² - 12 2 +36) 20 az 127 /144-144 2 az6 16,0. ane a are critical p points. 6

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