5.2.3 Operations with Complex Numbers - Worksheet (continued)
Example 5: Multiply. Write the result in the form a + bi . 20. (1 − 2 i )(1 + 2 i ) 21. 3 i (5 + 2 i )
22. (9 + i )(4 − i )
23. (6 + 8 i )(5 − 4 i )
24. (3 + i ) 2
25. ( − 4 − 5 i )(2 + 10 i )
Example 6: Simplify. 26. − i 9
27. 2 i 15
28. i 30
Example 7: Simplify. 29. − i i 5 4
− i 11 5 2 4 − i
i
i 8 2 5
30.
31. + +
34. − − i i 3 12 6
i
17
− i 45 3 7 8 −
32.
33.
+ i
4
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