Question

Find the common difference of the arithmetic sequence − 15 , − 13 , − 11 , . . . −15,−13,−11,...

Answer 1

Common difference = 2

Explanation:

We can find the common difference by subtracting any two consecutive terms with the smaller number being subtracted from the larger:

Thus, to find the common difference, d, we can subtract -13 from -15:

d = -15 - (-13) = -15 + 13 = 2