Q. Complete the recursive formula of the arithmetic sequence−15,−11,−7,−3,….c(1)=□c(n)=c(n−1)+□
Identify Common Difference: Identify the common difference in the sequence by subtracting any term from the term that follows it. For instance, subtracting the first term from the second term: −11−(−15)=−11+15=4.
Confirm Consistency: Confirm the common difference by checking if it is consistent between other consecutive terms. For example, subtract the second term from the third term: −7−(−11)=−7+11=4. The common difference is consistent and is 4.
Write Recursive Formula: Write the recursive formula for the arithmetic sequence. The recursive formula has two parts: the first term and the rule for finding the nth term from the (n−1)th term. The first term, c(1), is given as −15. The rule for finding the nth term is to add the common difference to the (n−1)th term, which is c(n)=c(n−1)+4.
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