chapter 4.8.
27) divide.
(x^2 + 5x - 9) / (x - 5)

42) divide.
(t^3 - t^2 + t - 1) / (t + 1)

Chapter 5.1
33) factor by grouping
x^3 + 3x^2 + 2x + 6

46) factor by group