8 Section 2.2.1, Complex roots. Page 141

  8.1 problem Example 2
  8.2 problem 1
  8.3 problem 2
  8.4 problem 3
  8.5 problem 4
  8.6 problem 5
  8.7 problem 6
  8.8 problem 8
  8.9 problem 9
  8.10 problem 18
  8.11 problem 19