Practice and Applications

5. $x = - 1.3, y = 5.2; x = 1.1, y = 3.9$
7. $x = 2.0, y = 0.0; x = 1.6, y = 0.6$
9. $x = - 0.7, y = 1.4; x = 0.7, y = 1.4$
11. $x = - 2, y = 7; x = 2, y = 7$
13. $x = 0.0, y = 0.0; x = 3.3, y = 4.3$
15. $x = 0, y = 0; x = 2, y = 16$
17. $L = \sqrt{3}, R = 1; L = - \sqrt{3}, R = 1$
19.

$\begin{array}{l} u = \frac{1}{12} (1 + \sqrt{97}), v = \frac{1}{18} (5 - \sqrt{97}); \\ u = \frac{1}{12} (1 - \sqrt{97}), v = \frac{1}{18} (5 + \sqrt{97}) \end{array}$
21.

$\begin{array}{l} x = 7, y = 5; x = 7, y = - 5; x = - 7, y = 5; \\ x = - 7, y = - 5 \end{array}$
23. $x = - 2, y = 2; x = \frac{2}{3}, y = \frac{10}{9}$
25. $- 4, - 2, 2, 4$
27. 1, 16
29. $\frac{1}{3}, - \frac{1}{7}$
31. 1, 1.65
33. $- \frac{3}{2}, 2$
35. $\frac{1}{4}, 49$
37. $\sqrt{3}, - \sqrt{3}, \frac{1}{2} j \sqrt{3}, - \frac{1}{2} j \sqrt{3}$
39. 6
41. 8
43. $\frac{9}{16}$
45. $\frac{1}{3} (11 - 4 \sqrt{15})$
47. 2
49. 4
51. 5
53. $- 1, 2$
55. $x = a + 1, y = ...$

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Basic Technical Mathematics, 11th Edition by Allyn J. Washington, Richard Evans