Can you help me on this problem? Only on number 14?

9-12 the curve. Estimate values, intervals of concavity, and inflection points, and use calcu- lus to find these quantities exactly. 9. f (x ) = 8x3 - 3x2 - 10 10. f(x) = * + 11x - 20 11. f (x ) = x19 -x2 12. f (x) = x - 2 sin x, - 2T S x = 2TT 13-14 1Ill Sketch the graph by hand using asymptotes and inter- cepts, but not derivatives. Then use your sketch as a guide to pro- ducing graphs (with a graphing device) that display the major features of the curve. Use these graphs to estimate the maximum and minimum values. 13 . f ( x ) = ( x + 4 ) ( x - 3 ) 2 x4( x - 1) 14. f ( x) = 10x(x - 1)4 (x - 2) 3 ( x + 1) 2 15. If f is the function considered in Example 3, use a computer algebra system to calculate f' and then graph it to confirm that all the maximum and minimum values are as given in th example. Calculate f" and use it to estimate the intervals of concavity and inflection points