What is the explicit formula for the sequence 7,2,-3,-8,-13

Question

Mathematics

Colby Fleming

7 January, 21:16

What is the explicit formula for the sequence 7,2,-3,-8,-13

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Answers (2)

Know the Answer?

Sienna Mcneil · Answer 1

You could say that a (n) = 12 - 5n.

Then ...

a (1) = 12 - 5 = 7

a (2) = 12 - 10 = 2

a (3) = 12 - 15 = - 3

and so on.

So it seems to work.

Kamora Burgess · Answer 2

7, 2, - 3, - 8, - 13

-5 - 5 - 5 - 5

a (n) = a₁ + d (n - 1)

a (n) = 7 - 5 (n - 1)

a (n) = 7 - 5 (n) + 5 (1)

a (n) = 7 - 5n + 5

a (n) = - 5n + 7 + 5

a (n) = - 5n + 12