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

14.7.1 problem 1
14.7.2 problem 2
14.7.3 problem 3
14.7.4 problem 4
14.7.5 problem 5
14.7.6 problem 6
14.7.7 problem 7
14.7.8 problem 8
14.7.9 problem 9
14.7.10 problem 10
14.7.11 problem 11