Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 3 - 3.1 - Quadratic Functions and Models - 3.1 Exercises - Page 249: 54

Answer

According to the graph the x-intercepts are: $(10,0)$ and $(-2,0)$
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Work Step by Step

$f(x)=0$ $x^2-8x-20=0~~$ ($a=1,b=-8,c=-20$): $x=\frac{-(-8)±\sqrt {(-8)^2-4(1)(-20)}}{2(1)}=\frac{8±\sqrt {144}}{2}=\frac{8±12}{2}$ $x=10$ or $x=-2$ x-intercepts: $(10,0)$ and $(-2,0)$
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