Math algebra 2 arithmetic

Question

What are the explicit equation and domain for an arithmetic sequence with a first term of 8 and a second term of 5

Answer 1

For an arithmetic series, find the common difference, which is 5-8 =-3 in this problem.

a₁ = 8

a₂ = a₁ - 3 = 8 - 3 = 5

...

a_n = a_n-1 - 3 = a₁ - 3(n -1)