Answer
$(4,5)$
Work Step by Step
Step 1. Graph $f(x)=x^2-9x+20$ as shown in the figure.
Step 2. The solutions to $f(x)=0$ can be found from x-intercepts as $x=4,5$
Step 3. The interval for $f(x)\lt 0$ can be identified from the graph as $(4,5)$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 3 - Polynomial and Rational Functions - 3.1 Quadratic Functions and Models - 3.1 Execises - Page 320: 88
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