Question

Complete the recursive formula of the arithmetic sequence 20, 26, 32, 38, ....

a(1) =
a(n) = a(n-1)+

Answer 1

Just use this form 》Un = a + (n -1)b

to solve this question

Answer 2

`\boxed{Un = 6n + 14}`

Explanation:

We know that

a = 20 and b = 6

.

So

`Un = a + (n - 1)b`

`Un = 20 + (n - 1)6`

`Un = 20 + 6n - 6`

`Un = 6n + 14`