Question: Please write it on paper In Problems 47-54, find the intervals on which f(x) is increasing and the intervals on which f(x) is decreasing. Then

Please write it on paper

In Problems 47-54, find the intervals on which f(x) is increasing and the intervals on which f(x) is decreasing. Then sketch the graph. Add horizontal tangent lines. 47. f (x) = 4+ 8x - x2 48. f(x) = 2x2 - 8x + 9 49. f( x) = x3 - 3x + 1 50. f(x) = x3 - 12x + 2 51. f(x) = 10 - 12x + 6x2 - x3 52. f ( x) = x + 3x2 + 3x 53. f(x) = x4 - 18x2 54. f(x) = -x4 + 50x2

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