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D Question 4 8 pts Determine whether the function is concave up or concave down when x = 5. f (a) = 23 - 9x2

D Question 4 8 pts Determine whether the function is concave up or concave down when x = 5. f (a) = 23 - 9x2 + 8x -7 Write your answer as "concave up" or "concave down"

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