Wednesday, March 4, 2009

Answers for the problems on the board

1. Find the first 4 terms

a) tn = 3tn-1 + 2; t1 = 10
Answer: 10, 32, 98, 296

b) tn = tn-1 + 4n; t1 = 3
Answer: 3, 11, 23, 39

2. Write a general term for

a) -6, -3, 2, 9, ...
Answer: tn = n2 -7

b) 32, 28, 24, ...
Answer: tn = -4n + 36 OR tn = tn-1 -4 ; t1 = 32

3. If the 50th term of a sequence is 221 and the common difference is 4, find term 1.

Answer: 25

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