Question: Question 14 (3 + 1 + 1 = 5 marks) Given the function f(x) = + 18x +3 3 2 (a) Show that there is


Question 14 (3 + 1 + 1 = 5 marks) Given the function f(x) = + 18x +3 3 2 (a) Show that there is a stationary point at x = 3, and determine its nature. (b) Find the interval(s) on which f is decreasing. (c) Show that f is concave up when x = 7
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