Question

Find the first 4 terms in each sequence​

Answer 1

a₁ = -21 (Given)

a₂ = -28

a₃ = -35

a₄ = -42

Explanation:

First term a₁ = -21 (Given)

…………………………………

Second term a₂ :

a₂ =
`a_(2-1) - 7\\a_(1) - 7\\a_(1) = -21\\-21 - 7 = -28`

…………………………………

Third term a₃ :

a₃ =
`a_(3-1) - 7\\a_(2) - 7\\a_(2) = -28\\-28 - 7 = -35`

…………………………………

Fourth term a₄ :

a₄ =
`a_(4-1) - 7\\a_(3) - 7\\a_(3) = -35\\-35 - 7 = -42`