Q. Complete the recursive formula of the arithmetic sequence−3,−1,1,3,…b(1)=□b(n)=b(n−1)+□
Identify Pattern: Identify the pattern in the sequence to determine the common difference. The sequence given is −3,−1,1,3,ext.... To find the common difference, subtract the first term from the second term: −1−(−3)=−1+3=2. The common difference is 2.
Recognize Formula: Recognize that a recursive formula for an arithmetic sequence has the form b(n)=b(n−1)+d, where d is the common difference. We have already determined that the common difference d is 2.
Write Recursive Formula: Write the recursive formula using the common difference and the first term of the sequence. The first term b(1) is given as −3. Therefore, the recursive formula is b(n)=b(n−1)+2.
Check Formula: Check the recursive formula by applying it to find the second term from the first term. Using b(n)=b(n−1)+2, we get b(2)=b(1)+2=−3+2=−1, which matches the second term of the sequence.
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