27 Chapter VII, Linear differential equations with constant coefficients. Article 50. Method of undetermined coefficients. Page 107

 27.1 problem Ex 1
 27.2 problem Ex 2
 27.3 problem Ex 3
 27.4 problem Ex 4
 27.5 problem Ex 5
 27.6 problem Ex 6
 27.7 problem Ex 7
 27.8 problem Ex 8
 27.9 problem Ex 9