Concept explainers
In Questions 4‒6, find a counterexample to prove that each conjecture is false.
Look at the equation
a. Substitute −3 in for x and find the corresponding value for y.
b. Repeat part a for
Conjecture: Any number substituted in for x will make
Counterexample:
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PATHWAYS TO MATH LITERACY 2ND (LL)
- Please show each steparrow_forwardIn Problems 11–48, perform the indicated operation, and write each expression in the standard form a + bi. 11. (2 — 3і) + (6 + 8i) 12. (4 + 5i) + (-8 + 2i) 13. (-3 + 2i) – (4 – 4i) 14. (3 – 4i) – (-3 – 4i) 15. (2 — 51) — (8+ 6і) 16. (-8 + 4i) – (2 – 2i) 17. 3(2 — 6і) 18. –4(2 + 8i) 19. 2i (2 — 3і) 20. Зi(-3 + 4i) \ 21. (3 – 4i) (2 + i) 22. (5 + 3i) (2 - i) 10 13 23. (-6 + i) (-6 — і) 24. (-3 + i) (3 + i) 25. 3 26. 5 - 12i 4i 2 + i 27. 2 - i 28. -2i 6 - i 29. 1 + i 2 + 3i 30. 1 - i V3 31. 33. (1 + i)? 34. (1 – i)? SECTION A.7 Complex Numbers; Quadratic Equations in the Complex Number System 35. Р3 36. i14 37. г15 38. 23 39. i6 – 5 41. 6i – 4i5 43. (1 + i) 48. i + + P + i 40. 4 + 3 42. 4i – 21 + 1 44. (3i)* + 1 45. i' (1 + ?) 46. 2i* (1 + ?) 47. * + i* + ² + 1arrow_forward5x – 2 d.x x2 + 1 10.)arrow_forward
- For Exercises 31–56, perform the indicated operations. Write the answers in standard form, a + bi. (See Examples 3-6) 31. (2 – 7i) + (8 – 3i) 32. (6 – 10i) + (8 + 4i) 33. (15 + 21i) – (18 – 40i) 34. (250 + 100i) – (80 + 25i) 35. (2.3 + 4i) – (8.1 – 2.7i) + (4.6 – 6.7i) 36. (0.05 – 0.03i) + (-0.12 + 0.08i) – (0.07 + 0.05i) 37. 2i(5 + i) 38. 4i(6 + 5i) 39. (3 – 6i)(10 + i) 40. (2 – 5i)(8 + 2i) 43. (3 – V-5)(4 + V-5) 46. (3 – 21)? + (3 + 2i)? 41. (3 - 42. (10 — З1)? 44. (2 + V=7)(10 + V-7) 45. (2 – i)? + (2 + i)? 47. (10 – 4i)(10 + 4i) 48. (3 9i)(3 + 9i) 49. (V2 + V3i)(V2 - V3i) 50. (V3 + V7i)(V5 – Vīi) 6 + 2i 51. 3 - i 5 + i 52. 4 - i 8 - 5i 53. 13 + 2i 10 – 3i 54. 11 + 4i 55. 13i 56. 7iarrow_forwardFor Exercises 9–14, find the modulus of each complex number. (See Example 2) 9. а. 20 - 21i b. -11 + 60i 10. a. 5 + 12i b. 7 - 24i 11. а. 4 6i b. -5 + 5i 12. a. -14 + 6i b. 3 + 9i 1 13. a. 3 2 3 b. - + -i 3 8 V3. b. -1 + 14. a. 2i 3 Too 2.arrow_forward
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