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