Answer
$a_n=1-4n$
$a_8=-31$
Work Step by Step
$-3, -7, -11, ...$
We have $a_1=-3$ and $d=-7-(-3)=-4$.
Using the formula $a_n=a_1+(n-1)d$, we get:
$a_n=-3+(n-1)*(-4)$
$a_n=-3-4n+4$
$\boxed{a_n=1-4n}$
Then $a_8=1-4*8=1-32=\boxed{-31}$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 11 - Further Topics in Algebra - 11.2 Arithmetic Sequences and Series - 11.2 Exercises - Page 1024: 24
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
