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Sequences and Series

Sequences and Series. Supachai Jinarak Wilaikiat Uppathum School. Arithmetic Sequences and Series. Arithmetic Series. Geometric Series. Sum of Terms. Sum of Terms. An introduction…………. Arithmetic Sequences. Geometric Sequences. ADD To get next term. MULTIPLY To get next term.

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Sequences and Series

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  1. Sequences and Series SupachaiJinarak WilaikiatUppathum School

  2. Arithmetic Sequences and Series

  3. Arithmetic Series Geometric Series Sum of Terms Sum of Terms An introduction………… Arithmetic Sequences Geometric Sequences ADD To get next term MULTIPLY To get next term

  4. Find the next four terms of –9, -2, 5, … Arithmetic Sequence 7 is referred to as the common difference (d) Common Difference (d) – what we ADD to get next term Next four terms……12, 19, 26, 33

  5. Find the next four terms of 0, 7, 14, … Arithmetic Sequence, d = 7 21, 28, 35, 42 Find the next four terms of x, 2x, 3x, … Arithmetic Sequence, d = x 4x, 5x, 6x, 7x Find the next four terms of 5k, -k, -7k, … Arithmetic Sequence, d = -6k -13k, -19k, -25k, -32k

  6. Vocabulary of Sequences (Universal)

  7. Given an arithmetic sequence with x 38 15 NA -3 X = 80

  8. -19 353 ?? 63 x 6

  9. 1.5 x 16 NA 0.5 Try this one:

  10. 9 633 x NA 24 X = 27

  11. -6 20 29 NA x

  12. The two arithmetic means are –1 and 2, since –4, -1, 2, 5 forms an arithmetic sequence Find two arithmetic means between –4 and 5 -4, ____, ____, 5 -4 5 4 NA x

  13. The three arithmetic means are 7/4, 10/4, and 13/4 since 1, 7/4, 10/4, 13/4, 4 forms an arithmetic sequence Find three arithmetic means between 1 and 4 1, ____, ____, ____, 4 1 4 5 NA x

  14. Find n for the series in which 5 y x 440 3 Factor! X = 16

  15. The 4th term of an arithmetic sequence is -9. The 8th term is 21. Find the first term and then 9th term. ____ _____ _____ -9 ____ ____ ____ 21 ____ 1st 5th 21 = -9 + (5-1)d 21 = -9 +4d 7.5 = d A4 = A1 + (4 -1)7.5 -9 = A1 + 3(7.5) -31.5 = A1 A9 = 21 + 7.5 = 28.5

  16. Geometric Sequences and Series

  17. Arithmetic Series Geometric Series Sum of Terms Sum of Terms Arithmetic Sequences Geometric Sequences ADD To get next term MULTIPLY To get next term

  18. Vocabulary of Sequences (Universal)

  19. Find the next three terms of 2, 3, 9/2, ___, ___, ___ 3 – 2 vs. 9/2 – 3… not arithmetic

  20. And S9 1/2 x 9 NA 2/3 Sn

  21. The two geometric means are 6 and -18, since –2, 6, -18, 54 forms an geometric sequence Find two geometric means between –2 and 54 -2, ____, ____, 54 -2 54 4 NA x

  22. -3, ____, ____, ____

  23. x 9 NA

  24. x 5 NA

  25. Insert one geometric mean between ¼ and 4 1/4 3 NA

  26. 1/2 7 x 127/128

  27. Infinite Series

  28. 1, 4, 7, 10, 13, …. No Sum Infinite Arithmetic Finite Arithmetic 3, 7, 11, …, 51 Finite Geometric 1, 2, 4, …, 64 1, 2, 4, 8, … Infinite Geometric r > 1 r < -1 No Sum Infinite Geometric -1 < r < 1

  29. Find the sum, if possible:

  30. Find the sum, if possible:

  31. Find the sum, if possible:

  32. Find the sum, if possible:

  33. Find the sum, if possible:

  34. 50 40 40 32 32 32/5 32/5 The Bouncing Ball Problem – Version A A ball is dropped from a height of 50 feet. It rebounds 4/5 of it’s height, and continues this pattern until it stops. How far does the ball travel?

  35. 100 100 75 75 225/4 225/4 The Bouncing Ball Problem – Version B A ball is thrown 100 feet into the air. It rebounds 3/4 of it’s height, and continues this pattern until it stops. How far does the ball travel?

  36. Sigma Notation

  37. UPPER BOUND (NUMBER) SIGMA (SUM OF TERMS) NTH TERM (SEQUENCE) LOWER BOUND (NUMBER)

  38. Rewrite using sigma notation: 3 + 6 + 9 + 12 Arithmetic, d= 3

  39. Rewrite using sigma notation: 16 + 8 + 4 + 2 + 1 Geometric, r = ½

  40. Rewrite using sigma notation: 19 + 18 + 16 + 12 + 4 Not Arithmetic, Not Geometric 19 + 18 + 16 + 12 + 4 -1 -2 -4 -8

  41. Rewrite the following using sigma notation: Numerator is geometric, r = 3 Denominator is arithmetic d= 5 NUMERATOR: DENOMINATOR: SIGMA NOTATION:

  42. Thank you SupachaiJinarak WilaikiatUppathum School

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