Answer
$a=-2$
Work Step by Step
Given:
$f(x)=ax^{2}+4$ $(-1,2)$
Plug in the given values of $x$ and $y$ and solve for $a$.
$2=a(-1)^{2}+4$
$2=a+4$
$a=-2$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 2 - Functions and Their Graphs - 2.2 The Graph of a Function - 2.2 Assess Your Understanding - Page 64: 5
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