Q. Complete the recursive formula of the arithmetic sequence−5,−25,−45,−65,….b(1)=□b(n)=b(n−1)+□
Identify first term: Identify the first term of the sequence. The first term, b(1), is given as −5. This will be the starting point of our recursive formula.
Determine common difference: Determine the common difference by subtracting any term from the term that follows it. For instance, subtracting the first term from the second term: −25−(−5)=−20. This is the common difference, which is consistent throughout the sequence.
Write recursive formula: Write the recursive formula using the first term and the common difference. The recursive formula for an arithmetic sequence is b(n)=b(n−1)+d, where d is the common difference. Since we have determined that the common difference is −20, we can write the recursive formula as b(n)=b(n−1)−20.
More problems from Write a formula for an arithmetic sequence