Exercise To Try 8 For the curve f (x) = 2r-9a2 + 12r - 5, find (i) the local marimum and minimum values, (ii), the intervals on which f is increasing or decreasing, and (ii) the intervals of concavity and the inflection points. (a) Find critical points: (find where f'(r) = 0 or where f'(x) is undefined). (b) Use 2nd derivative test to determine which of the critical points are local min/max. (c) Use the 1st derivative test for any inconclusive points, and to find where f(r) is in- creasing/decreasing.

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