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Which formula can be used to describe the sequence below? –8, –5, –2, 1, 4, ...

User Thrastylon
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2 Answers

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D. an = an-1+3; a1 = -8

EG. 2020

User Smozgur
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5 votes

Answer:

an = -8 +3(n-1)

an = -11 +3n

f(n) = -11 +3n

Explanation:

–8, –5, –2, 1, 4, ...

This is an arithmetic sequence.

We are increasing by 3 each time

-8 +3 = -5

-5+3 = -2

-2 +3 = 1

The common difference is 3

The formula for an arithmetic sequence is

an = a1 +d (n-1)

an = -8 +3(n-1)

an = -8 +3n -3

an = -11 +3n

The nth term is -11 +3n

f(n) = -11 +3n

User Julien Rodrigues
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