Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 5 - Exponential and Logarithmic Functions - 5.1 Composite Functions - 5.1 Assess Your Understanding: 1

Answer

$f(3) = -21$

Work Step by Step

RECALL: $f(a)$ represents the value of the function $f$ when $x=a$. Substitute $3$ into $x$ in the function $f$ to obtain: $f(3) = -4(3^2)+5(3) \\f(3) = -4(9) + 15 \\f(3) = -36 + 15 \\f(3) = -21$
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