Q. Complete the recursive formula of the arithmetic sequence −15,−11,−7,−3,…c(1)=□c(n)=c(n−1)+□
Identify First Term: To find the first term of the arithmetic sequence, we look at the given sequence: −15,−11,−7,−3,…. The first term is clearly stated as −15.
Determine Common Difference: The recursive formula for an arithmetic sequence is generally given by c(n)=c(n−1)+d, where d is the common difference between the terms. To find the common difference, we subtract any term from the term that follows it in the sequence.
Calculate Common Difference: Subtracting the first term from the second term: −11−(−15)=−11+15=4. This is the common difference.
Complete Recursive Formula: Now we can complete the recursive formula. The first term c(1) is −15, and the common difference d is 4. Therefore, the recursive formula is c(n)=c(n−1)+4.
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