Answer
for $a=2.1349, b= 2.0781$
for $a=-2.044, b= -11.5982$
Work Step by Step
Substitute $b=3a^2+3a-18$
$3a^2+3a-18=-8a^2+4a+30$
$ 11a^2-a-48=0$
$a=2.1349 , -2.044$
for $a=2.1349, b= 2.0781$
for $a=-2.044, b= -11.5982
$
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 1-4 - Cumulative Review - Page 408: 17
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