72.10 Chapter 3. Second order linear equations. Section 15. The General Solution of the Homogeneous Equation. Problems at page 117

72.10.1 problem 1
72.10.2 problem 2
72.10.3 problem 3
72.10.4 problem 4
72.10.5 problem 5
72.10.6 problem 6 (a)
72.10.7 problem 6 (c)
72.10.8 problem 6 (d)
72.10.9 problem 7 (a)
72.10.10 problem 11 (b)