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