5 Chapter 8, Ordinary differential equations. Section 5. SECOND-ORDER LINEAR EQUATIONSWITH CONSTANT COEFFICIENTS AND ZERO RIGHT-HAND SIDE. page 414

 5.1 problem 1
 5.2 problem 2
 5.3 problem 3
 5.4 problem 4
 5.5 problem 5
 5.6 problem 6
 5.7 problem 7
 5.8 problem 8
 5.9 problem 9
 5.10 problem 12
 5.11 problem 19
 5.12 problem 20
 5.13 problem 24
 5.14 problem 25
 5.15 problem 26
 5.16 problem 28