Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 12 - Circles - 12-1 Tangent Lines - Practice and Problem-Solving Exercises - Page 767: 14



Work Step by Step

Applying the Pythagorean Theorem: $$ x^2+15^2=\left(x+9\right)^2 \\ x^2+225=x^2+18x+81\\ -18x=-144 \\ x=8.0$$
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