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Algebraic Sequences Part B Obj:  Determine the sequence of the  n th term of an algebraic expression.
Example 1 Write the first five terms of the sequence that has an  n th term of 6 n  + 7 Step 1:   Build a table Position 1 2 3 4 5 Term
Step 2 Fill in the table using the position numbers. To find the  first  term in the sequence, substitute  1  for  n . 6 n  + 7 6 (1)  + 7 6 + 7 = 13 13 Position 1 2 3 4 5 Term
Step 2 (continued) Fill in the table using the position numbers. To find the  second  term in the sequence, substitute  2  for  n . 6 n  + 7 6 (2)  + 7 12 + 7 = 19 13 19 Position 1 2 3 4 5 Term
Step 2 (continued) Fill in the table using the position numbers. To find the  third  term in the sequence, substitute  3  for  n . 6 n  + 7 6 (3)  + 7 18 + 7 = 25 13 19 25 Position 1 2 3 4 5 Term
Step 2 (continued) Fill in the table using the position numbers. To find the  fourth  term in the sequence, substitute  4  for  n . 6 n  + 7 6 (4)  + 7 24 + 7 = 31 13 19 25 31 Position 1 2 3 4 5 Term
Step 2 (continued) Fill in the table using the position numbers. To find the  fifth  term in the sequence, substitute  5  for  n . 6 n  + 7 6 (5)  + 7 30 + 7 = 37 13 19 25 31 37 Position 1 2 3 4 5 Term
Example 2  The Shortcut Write the first five terms of the sequence that has an  n th term of -3 n  + 11 Step 1:   Build a table Step 2:   To find the  first  term in the sequence, substitute  1  for  n . -3 n  + 11 -3 (1)  + 11 -3 + 11 = 8 8 Position 1 2 3 4 5 Term
Example 2  The Shortcut Write the first five terms of the sequence that has an  n th term of -3 n  + 11 Step 3:  The Shortcut -3 n  + 11 8 The  coefficient  of n is the common difference between terms. -3 -3 -3 -3 5 -1 2 -4 Position 1 2 3 4 5 Term
Example 3  The Shortcut #2 Write the first five terms of the sequence that has an  n th term of -5 n  + 9 Step 1:   Build a table  (this time include zero) Step 2:   To find the  zero  term in the sequence, substitute  0  for  n . -5 n  + 9 -5 (0)  + 9 0 + 9 = 9 9 Position 0 1 2 3 4 5 Term
Example 2  The Shortcut Write the first five terms of the sequence that has an  n th term of -3 n  + 11 Step 3:  The Shortcut -5 n  + 9 9 The  coefficient  of n is the common difference between terms. -5 -5 -5 -5 4 -6 -1 -11 -16 -5 First five terms Position 0 1 2 3 4 5 Term
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Algebraic Sequences Part B

  • 1. Algebraic Sequences Part B Obj: Determine the sequence of the n th term of an algebraic expression.
  • 2. Example 1 Write the first five terms of the sequence that has an n th term of 6 n + 7 Step 1: Build a table Position 1 2 3 4 5 Term
  • 3. Step 2 Fill in the table using the position numbers. To find the first term in the sequence, substitute 1 for n . 6 n + 7 6 (1) + 7 6 + 7 = 13 13 Position 1 2 3 4 5 Term
  • 4. Step 2 (continued) Fill in the table using the position numbers. To find the second term in the sequence, substitute 2 for n . 6 n + 7 6 (2) + 7 12 + 7 = 19 13 19 Position 1 2 3 4 5 Term
  • 5. Step 2 (continued) Fill in the table using the position numbers. To find the third term in the sequence, substitute 3 for n . 6 n + 7 6 (3) + 7 18 + 7 = 25 13 19 25 Position 1 2 3 4 5 Term
  • 6. Step 2 (continued) Fill in the table using the position numbers. To find the fourth term in the sequence, substitute 4 for n . 6 n + 7 6 (4) + 7 24 + 7 = 31 13 19 25 31 Position 1 2 3 4 5 Term
  • 7. Step 2 (continued) Fill in the table using the position numbers. To find the fifth term in the sequence, substitute 5 for n . 6 n + 7 6 (5) + 7 30 + 7 = 37 13 19 25 31 37 Position 1 2 3 4 5 Term
  • 8. Example 2 The Shortcut Write the first five terms of the sequence that has an n th term of -3 n + 11 Step 1: Build a table Step 2: To find the first term in the sequence, substitute 1 for n . -3 n + 11 -3 (1) + 11 -3 + 11 = 8 8 Position 1 2 3 4 5 Term
  • 9. Example 2 The Shortcut Write the first five terms of the sequence that has an n th term of -3 n + 11 Step 3: The Shortcut -3 n + 11 8 The coefficient of n is the common difference between terms. -3 -3 -3 -3 5 -1 2 -4 Position 1 2 3 4 5 Term
  • 10. Example 3 The Shortcut #2 Write the first five terms of the sequence that has an n th term of -5 n + 9 Step 1: Build a table (this time include zero) Step 2: To find the zero term in the sequence, substitute 0 for n . -5 n + 9 -5 (0) + 9 0 + 9 = 9 9 Position 0 1 2 3 4 5 Term
  • 11. Example 2 The Shortcut Write the first five terms of the sequence that has an n th term of -3 n + 11 Step 3: The Shortcut -5 n + 9 9 The coefficient of n is the common difference between terms. -5 -5 -5 -5 4 -6 -1 -11 -16 -5 First five terms Position 0 1 2 3 4 5 Term