Question

Complete the recursive formula of the arithmetic sequence

-5,-25,-45,-65,.....

b (1) = - ?
b (1) = b (n - 1) + ?

Answer 1

subtract 20 from the previous term, the recursive formula is b(n) = b(n-1) - 20. As for the initial condition, b(1) is equal to -5.

Answer 2

a = -5

Explanation:

a is the first term which is -5

b is the common difference -20 = -45 - (-25) Applying the formula U(2) - U(1)

b(1) = -20(1-1) + (-5)

b(1) = -5