Question

Find an explicit formula for the following sequence, an, which starts with a1=−8.

−8,−5,−2,1,4,…

Answer 1

Answer:it’s is D

Explanation:

Answer 2

Formula for an is 3n - 11

Explanation:

• Step 1: Equation for a(n) = a + (n - 1)d where a = - 8, d = common difference = a2 - a1 = -5 - -8 = 3

⇒ a(n) = -8 + (n - 1)3 = - 8 + 3n - 3 = 3n - 11