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# 2.2-2.5 review (2)

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### 2.2-2.5 review (2)

1. 1.  x = -1, 0 , 1 x = -2, 0, 2 x = -2, -1, 1, 2
2. 2. x = -2, 0, 2 x = -2, -1, 1, 2 x = -1, 0 , 1
3. 3.  a < 0; x = 2, -1
4. 4.  -(x – 2) (x + 1)
5. 5.  a < 0; x = 2, -1, 3 5 a > 0; x = 0, 6 (double root), 2i
6. 6. 4 3 2x 7 x 8x 8x 8
7. 7. 5 4 3 2x 12x 40x 48x 144x
8. 8.  x = 2 (double root) 5 x = 0 (triple root), 2, -3 x= 6 3
9. 9.  . f ( x) x 4 4x 3 x 2 20 x 20
10. 10.  . ( x) f x 5 x 4 6x 3
11. 11.  . ( x) f x 2 12 x 33
12. 12. (7 + 5i) + (-4 + 2i)
13. 13. 3+ 7i
14. 14. (2 - 6i) – (-3 + i)
15. 15. 5 – 7i
16. 16. (1 – 5i)(3 – 2i)
17. 17. -7 – 17i
18. 18. _6 i 4 i
19. 19. 6 i 4 i4 i 4 i 224 6i 4i i 216 4i 4i i24 6i 4i 116 4i 4i 123 10i 17
20. 20. 4 2 . f ( x) x 4x 5
21. 21.  x = ± i 5, x 1
22. 22.  . f ( x) 4x 3 4x 2 15 x
23. 23.  x = 0, x = -3/2, x = 5/2
24. 24. 3 2 . f ( x) 2x 13x 13x 3
25. 25.  P/q : ±1, ±3, ±1/2, ±3/2 1 7 61x= , x 2 2
26. 26.  . f ( x) x 4 6x 3 x 2 54 x 72
27. 27.  p/q = ±1, ±2, ±3, ±4, ±6, ±8, ±9, ±12, ±18, ±24, ±36 , ±72 x = -2, x = -4, x = -3, x = 3
28. 28. 3 2 . f ( x) 2x x 25 x 12
29. 29.  p/q = ±1, ±2, ±3, ±4, ±6, ±12, ±1/2, ±3/2 x = 3, x = ½, x = -4
30. 30. 3 2 . f ( x) 2x 5x 9x 8
31. 31.  x = -1.661, x = .695, x = 3.465
32. 32. . f ( x) x5 3x 4 13x3 39 x 2 36 x 108, ( x 3)
33. 33. ( x 3)( x 3)( x 2)( x 2)( x 3)