Geometry: Common Core (15th Edition)

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

Skills Handbook - Squaring Numbers and Finding Square Roots - Exercises: 14

Answer

$a=3\text{ or }a=-3$

Work Step by Step

To solve the equation $a^2=9$, we must perform the opposite operation of squaring, which is taking the square root, in order to clear the exponent: $$a^2=9$$$$\sqrt {a^2}=\sqrt {9}$$$$a=\pm3$$$$a=3\text{ or }a=-3$$
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