Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 11 - Further Topics in Algebra - Summary Exercises on Sequences and Series - Exercises - Page 1038: 3


$-\dfrac {5}{2}$

Work Step by Step

$\left( -7\right) -\left( -\dfrac {9}{2}\right) =\left( -\dfrac {9}{2}\right) -\left( -2\right) =\left( -2\right) -\dfrac {1}{2}=\dfrac {1}{2}-3=-\dfrac {5}{2}$ So this is arithmetic sequence $d=a_{n+1}-a_{n}=\left( -7\right) -\left( -\dfrac {9}{2}\right) =-\dfrac {5}{2}$
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