8.7 Chapter 2. Second order differential equations. Section 2.2. Linear equations with constant coefficients. Excercises page 140

8.7.1 problem 1
8.7.2 problem 2
8.7.3 problem 3
8.7.4 problem 4
8.7.5 problem 5
8.7.6 problem 6
8.7.7 problem 7
8.7.8 problem 8
8.7.9 problem 9
8.7.10 problem 10
8.7.11 problem 11