Q. Find the common difference of the arithmetic sequence 9,12,15,…Answer:
Identify pattern: Identify the pattern in the sequence.The given sequence is 9,12,15,…, which suggests that it is an arithmetic sequence because it appears that each term increases by a constant amount.
Calculate difference: Calculate the common difference between consecutive terms.To find the common difference, subtract the first term from the second term: 12−9=3.
Verify consistency: Verify the common difference with another pair of consecutive terms.Subtract the second term from the third term to ensure the common difference is consistent: 15−12=3.
Conclude common difference: Conclude the common difference of the sequence.Since both differences calculated are the same, the common difference of the arithmetic sequence is 3.