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Algebra 2: Unit 3 Answer Key Section 3.1: Relations and Functions 1. 2. 3. 4. 5. 6. Not a function; D: [-2, 2]; R: [-2, 2] Not a function; D: [-2, ∞]; R:[-∞, ∞] Not a function; D: [-2, ∞]; R:[-∞, ∞] Function; D: [-∞,∞]; R: [-1, ∞] Function; D: [-∞, ∞]; R: [-1, 1] Not a function; D: [0, 2]; R: [-2, 2] 7. 8. 9. 10. 11. 12. -7 38 -6 -2 32 14/3 13. 14. 15. 16. 17. 18. Function Function Not a function Function Not a function Not a function Section 3.2: Function Operations 1. 2x2 + 4x + 2 2. 8x3 – 2x2 + 12x – 3 3. 2x2 - 4x + 4 4. 5. 2x + –1 6. 2x - 11. 12. 13. 14. 15. +1 7. 8. - 2x – 1 9. -4 10. 17/5 -4/5 -2 -4x + 7 -19 16. 17. 18. 19. 20. 2x2 - 3x – 7 -8x + 6 7/5 3x2 -17x + 10 Section 3.3: Inverse Functions 1. y-1 = 2. y-1 = x – 2 3. y-1 = x/3 – 1 11. y-1 = x2 – 6x + 9 7. y-1 = 12. y-1 = 8. y-1 = 13. y-1 = -1 4. y = 5. y-1 = 6. y-1 = x2 - 4x + 7 -1 9. y = 14. y-1 = 15. y-1 = x2 +1 10. y-1 = Unit 3 Review 1. 2. 3. 4. 3x2 +5x – 2 3x2 – 5x + 2 -15x3 + 6x2 -15x3 + 6x2 13. 4900 14. 4 15. 40 16. y-1 = 5. 17. y-1 = 6. 18. y-1 = x2 – 4 7. 8. 9. 10. 11. 12. 256 4 49 1 81 19. y-1 = 20. y-1 = x2 + 3 21. y-1 = 22. 1 23. -2 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 13 -1 18 3 Function Function Function Not a function Function; D: [-∞, ∞]; R: [-∞,∞] Function; D: [-∞, ∞]; R: [0,∞] Not a function; D: [-1, 3]; R: [0, 4]