Find an explicit formula for the arithmetic sequence -11,-3,5,13,...

asked Feb 24, 2018 75.3k views

1 vote

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5 votes

In this sequence, a1 = -11, k = 8

So an = a1 + (n-1)k = -11 + (n-1)*8 = 8n - 19

Celerno answered Feb 27, 2018

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4 votes

tn=-11+8(n-1). n represents which number of the sequence you will find, so if you plugged in a 3 you would find the third number in the sequence.

Fabien Kruba answered Mar 2, 2018

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