21 and 23 please

Finding Points of Inflection In Exercises $17 ? 32$ , find the points of inflection and discuss the concavity of the graph of the function. 17. $f (x) = x^{3} ? 9 x^{2} + 24 x ? 18$ 18. $f (x) = ? x^{3} + 6 x^{2} ? 5$ 19. $f (x) = 2 ? 7 x^{4}$ 20. $f (x) = 4 ? x ? 3 x^{4}$ 21. $f (x) = x (x ? 4)^{3}$ 22. $f (x) = (x ? 2)^{3} (x ? 1)$ 23. $f (x) = x x + 3$ 24. $f (x) = x 9 ? x$ 25. $f (x) = \frac{6 ? x}{x}$ 26. $f (x) = \frac{x + 3}{x}$

Question

21 and 23 please
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Finding Points of Inflection In Exercises

17 ? 32

, find the points of inflection and discuss the concavity of the graph of the function. 17.

f (x) = x^{3} ? 9 x^{2} + 24 x ? 18

18.

f (x) = ? x^{3} + 6 x^{2} ? 5

19.

f (x) = 2 ? 7 x^{4}

20.

f (x) = 4 ? x ? 3 x^{4}

21.

f (x) = x (x ? 4)^{3}

22.

f (x) = (x ? 2)^{3} (x ? 1)

23.

f (x) = x x + 3

24.

f (x) = x 9 ? x

25.

f (x) = \frac{6 ? x}{x}

26.

f (x) = \frac{x + 3}{x}

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