I.S.U. Quiz #5...sine and cosine law word
problems...you need to re-memorize and
know how to use the formulas
...Thursday, April 8th
Friday, April 9th
...Quiz on Recursion Formulas (today) and
Binomial Theorem (tomorrow)
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Recursion Formulas
Definitions
A. Explicit Formulas...All formulas that we have used so far have been explicit, because in order to find a term, we have not needed to know the one before it.
example: tn=2 + 3n
tn = 5(­2)n­1
To find t6, we do not need to know t5 ­­ we just put n = 6 into the formulas.
B. Recursion Formulas
Examples
1. Find the first 6 terms of each sequence:
a) t1 = 4 , tn = 6 + tn­1
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b) t1 = 7 and tn = ­3tn ­ 1
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c) t1 = 1 , t2 = ­2 , tn = 6tn ­ 1 ­ 9tn ­ 2
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