Find the eighth term of an arithmetic sequence if the first term is 5 and the common difference is 6.

Question

a₈ = 

Answer 1

a_n = a₁ + ( n - 1 )d

a_n = 5 + (n - 1) 6

a_n = 6n - 1

∴ a₈ = 6 ⋅ 8 - 1 = 47

Answer 2

a₅ = 5 + 4(6) This is a basic formula. Familiarize yourself with it!