Exercises 7.1, page 224

1. $- \frac{1}{3}, - 2$ $- \frac{1}{3}, - 2$
3. $a = 1, b = - 2, c = - 4$ $a = 1, b = - 2, c = - 4$
5. Not quadratic, no $x^{2} -term$ $x^{2} -term$
7. $a = 1, b = - 1, c = 0$ $a = 1, b = - 1, c = 0$
9. Not quadratic, has $y^{3} -term$ $y^{3} -term$
11. $5, - 5$ $5, - 5$
13. $\frac{3}{2}, - \frac{3}{2}$ $\frac{3}{2}, - \frac{3}{2}$
15. $- 2, 7$ $- 2, 7$
17. 3, 4
19. $0, \frac{5}{2}$ $0, \frac{5}{2}$
21. $\frac{1}{2}, - \frac{1}{2}$ $\frac{1}{2}, - \frac{1}{2}$
23. $\frac{1}{3}, 4$ $\frac{1}{3}, 4$
25. $- 1, \frac{3}{7}$ $- 1, \frac{3}{7}$
27. $\frac{2}{3}, \frac{3}{2}$ $\frac{2}{3}, \frac{3}{2}$
29. $\frac{1}{2}, - \frac{3}{2}$ $\frac{1}{2}, - \frac{3}{2}$
31. $- \frac{2 b}{3}, \frac{b}{2}$ $- \frac{2 b}{3}, \frac{b}{2}$
33. $\frac{5}{2}, - \frac{9}{2}$ $\frac{5}{2}, - \frac{9}{2}$
35. $0, - 2$ $0, - 2$
37. $- a - b, - a + b$ $- a - b, - a + b$
39. $- a - b, - a + b$ $- a - b, - a + b$
41. $x = 3 or x = \frac{1}{2}, 3 + \frac{1}{2} = \frac{- (- 7)}{2} = \frac{7}{2}$ $x = 3 or x = \frac{1}{2}, 3 + \frac{1}{2} = \frac{- (- 7)}{2} = \frac{7}{2}$
43. 4
45. $2 A, - 6 A$ $2 A, - 6 A$ (if current is negative)
47. 2 a.m., 10 a.m.
49. $2 x^{2} - 5 x + 2 = 0$ $2 x^{2} - 5 x + 2 = 0$
51. $- 1, 0, 1$ $- 1, 0, 1$
53. $\frac{3}{2}, 4$ $\frac{3}{2}, 4$
55. $- 2, \frac{1}{2}$ $- 2, \frac{1}{2}$
57. 3 N/cm, 6 N/cm
59. 30 km/h, 40 km/h

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Table of Contents for Exercises 7.1, page 224