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Exercises 1.7, page 33

1. $3 x - 3 y$
3. $4 a x + 5 s$
5. 8x
7. $y + 4 x$
9. $- 5 s$
11. $5 F - 3 T - 2$
13. $- a^{2} b - a^{2} b^{2}$
15. $p - 6$
17. $9 x - v - 7$
19. $5 a - 5$
21. $- 5 a + 2$
23. $- 2 t + 5 u$
25. $7 r + 8 s$
27. $- 50 + 19 j$
29. $7 n - 7$
31. $18 - 2 t^{2}$
33. 6a
35. $2 a Z + 1$
37. $3 z - 5$
39. $8 p - 5 q$
41. $- 4 x^{2} + 22$
43. $7 V^{2} - 3$
45. $- 6 t + 13$
47. $4 Z - 24 R$
49. $2 D + d$
51. $3 B - 2 α$
53. $12 x + 200$
55.
1. $x^{2} + 2 y + 2 a - b$
2. $3 x^{2} - 4 y + 2 a + b$
57. No; did not change signs correctly
59. Yes; $| a - b | = | - (b - a) | = | b - a |$

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