Which of the following is UNLIKE the others with respect to the rate of change (common difference)?
A. 2, 8, 12, 20, 26
B. f(x) = 6x − 2
C. an = −5 + 6(n − 1)
D. f(x) = 6x +1
The correct answer is D. f(x) = 6x + 1.
In options A, C, and D, the rate of change (common difference) is constant. However, in option B, f(x) = 6x - 2, the rate of change is not constant. Each term increases by 6, but there is a decrease of 2 between each term.