Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 1 - Functions and Their Graphs - Section 1.2 The Graph of a Function - 1.2 Assess Your Understanding: 5

Answer

$a = -2 $

Work Step by Step

$f(-1) = (-1)^{2}a + 4 \\f(-1) = 1(a^2)+4 \\f(-1)=a^2+4$ Since $f(-1) = 2$, then $f(-1)=a^2+4 \\2 = a + 4 \\2-4=a \\-2=a$
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