78.11 Chapter 3. Second order linear equations. Section 16. The Use of a Known Solution to find Another. Problems at page 121

78.11.1 problem 2 (a)
78.11.2 problem 2 (b)
78.11.3 problem 3
78.11.4 problem 4
78.11.5 problem 5
78.11.6 problem 6
78.11.7 problem 7 (a)
78.11.8 problem 7 (b)
78.11.9 problem 7 (c)
78.11.10 problem 8
78.11.11 problem 9
78.11.12 problem 10 (a)
78.11.13 problem 10 (b, n=1)
78.11.14 problem 10 (b, n=2)
78.11.15 problem 10 (c, n=3)
78.11.16 problem 11