Question

Type the first 2 terms of the geometric sequence having a1= 2 r= 4 Type in this way: n= 1, 2

Answer 1

a1 = 2 a2 = 8

Explanation:

Geometric sequence general formula is

An=a1(r)^n-1

Let's just plug in the a1 and r into the formula

An=2(4)^n-1

So you can now calculate any terms by just plugin in n

a1 = 2(4)^0 = 2

a2 = 2(4)^1 = 8

a3 = 2(4)^2 = 32

a4 = 2(4)^3 = 128