Question
Write an equation to describe the sequence below Use n to represent the position of a term in the sequence, where n=1 for the first term. 40,80,160, ... Write your answer using decimals and integers. a_(n)=square (square )^n-1
Solution
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(238 Votes)
Mason
Professional ยท Tutor for 6 years
Answer
First, we identify
, which signifies the first term in the sequence. In this case we have:40, 80, 160, ...Therefore,
after looking at this list of numbers.Then we decide
, which reflects the common ratio between successive terms in the sequence. Notice that every term is doubling the previous one, hence, the ratio,
. Given this information, substitute
and
into the sequence formula that reads as
. We eventually get:
If we conclude from these findings, the provided sequence of
is summarized explicitly in the formula notation
putting the terms into the boxes of the question.