find the first four terms of the sequence an=n(5n+5)

Question

A) 10, 30, 65, 110

B)  5, 15, 20, 25

C) 10, 30, 60, 100

Answer 1

Plug in values of n starting from 1.

So plug in 1,2,3,4...

When we plug in 1 we get 1(5(1) + 5) = 1(5+5)= 10

2(5(2) + 5) = 2(10 + 5) = 2(15) =  30 

3(5(3) + 5) = 60

So the answer is C.

 

We can continue to get 4(5(4) + 5) = 100