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NUMBER 28 AND 30 ONLY Find the largest open intervals on which each function is concave upward or concave downward, and find the location of

NUMBER 28 AND 30 ONLY

Find the largest open intervals on which each function is concave upward or concave downward, and find the location of any points of inflection. (See Example 4.) 25. f(x) = x + 3x - 5 26. f(x) = -x + 8x - 7 27. f(x) = x3 + 4x2 - 6x +3 28. f(x) = 5x' + 12x- - 32x - 14 2 29. f(x) x- 4 -2 30. f(x) = x+1

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