6 Chapter 2, Second order linear equations. Section 2.2.2 Real eigenvalues. Exercises page 90

6.1 problem 1(a)
6.2 problem 1(b)
6.3 problem 1(c)
6.4 problem 1(d)
6.5 problem 3(a)
6.6 problem 3(b)
6.7 problem 3(c)
6.8 problem 3(d)