Formula for an for the arithmetic sequence.
ah = -1, d = -7

The formula for the arithmetic sequence will be:

Step-by-step explanation:

Given

so

a₂ = a₁ +  d

    = -1 + (-7)          ∵ a₁ = -1

    = -1 - 7

     = -8

similarly,

a₃ = a₂ + d

     = -8 + (-7)

     = -8 - 7

      = -15

and so on

Thus, the Arithmetic sequence becomes

a₁, a₂, a₃, ...

-1, -8, -15, ...

as

Therefore, An arithmetic sequence has a constant difference d and is defined by

substituting a₁ = -1 and d = -7

Hence, the formula for the arithmetic sequence will be:

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step-by-step explanation: