Answer
$l^2-x^2=225$
Work Step by Step
$l$ is the hypotenuse, while $x$ and the 15 foot side are the legs of the right triangle.
Use the Pythagorean Theorem to write an equation connecting $l$ and $x$:
$l^2=x^2+15^2$
$l^2=x^2+225$
$l^2-x^2=225$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 1 - 1.4 - Quadratic Equations and Applications - 1.4 Exercises - Page 113: 119a
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