14.8 Chapter 2. Second order differential equations. Section 2.2.1 Linear equations with constant coefficients (complex roots). Excercises page 144

14.8.1 problem 1
14.8.2 problem 2
14.8.3 problem 3
14.8.4 problem 4
14.8.5 problem 5
14.8.6 problem 6
14.8.7 problem 8
14.8.8 problem 9
14.8.9 problem 11
14.8.10 problem 18
14.8.11 problem 19