#### Answer

$-4,4,-4,4$

#### Work Step by Step

$a_n=4(-1)^n$
$a_1=4(-1)^1=-4$
$a_2=4(-1)^2=4$
$a_3=4(-1)^3=-4$
$a_4=4(-1)^4=4$

Published by
Brooks Cole

ISBN 10:
0-53449-636-9

ISBN 13:
978-0-53449-636-4

$-4,4,-4,4$

$a_n=4(-1)^n$
$a_1=4(-1)^1=-4$
$a_2=4(-1)^2=4$
$a_3=4(-1)^3=-4$
$a_4=4(-1)^4=4$

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