Ok so this is a late blog soooo yea...It will be on chapter 13 on the formulas. There are 2 types of the formulas: arithmetic and geometric. The first one i will discuss is arithmetic.
The formula for arithmetic is tn=t1 + (n-1)d where n is the term number, t1 is the first term and d is what you add. For arithmetic, you will add or subtract numbers.
The other formula the the geometric formula. the formula for geometric is tn=t1-r^(n-1) where r is what you multiply by. For geometric formulas, you will multiply.
these are pretty easy formulas to remember but what i have problems with is finding the term numbers.
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1. Find the formula for the nth term of the arithmetic sequence: 3,5,7,...
ReplyDeletetn = 3 + (n-1) (2)
tn = 3 +2n - 2
tn = 1 + 2
2. Find the formula for the nth term of the sequence: 3,4.5,6.75,..
**divide the 2nd term by the 1st term to find r
4.5/3 = 3/2 = r
tn = 3 . (3/2)^(n-1)
**i think you can solve it further but i dont know if you have too...