Answer
$a=-2$
Work Step by Step
We need to find $a$ so that (-1,2) is on the graph of:
$f(x)=ax^{2}+4$
We plug in the point:
$f(-1)=a(-1)^{2}+4$
$f(-1)=a+4$
$2=a+4$
$a=2-4$
$a=-2$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 3 - Section 3.2 - The Graph of a Function - 3.2 Assess Your Understanding - Page 218: 5
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