5.1 Review Worksheet, Part 2 (continued)
5.1.5 Complex Numbers and Roots Express each number in terms of i . 19. − 8 4 20. − − 90
1 3
21.
22. − 50
− 6 12
Solve each equation. 23. x 2 + 49 = 0
1 2
24. 5 x 2 = − 80
25. 3 x 2 + 27 = 0
26.
=− x 2
32
Find the values of x and y that make each equation true. 27. 9 x + ( y ) i − 5 = − 12 i + 4
28. 5( x − 1) + (3 y ) i = − 15 i − 20
Find the zeros of each function. 29. f ( x ) = x 2 + 2 x + 3
30. g ( x ) = 4 x 2 − 3 x + 1
31. f ( x ) = x 2 + 4 x + 8
32. g ( x ) = 3 x 2 − 6 x + 10
Find each complex conjugate. 33. i
i 10
34. − − i 3 2 2
35. − 2.5 i + 1
36.
1
−
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