Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Appendix A - A.2 - Formulas and Equations - Exercises - Page 546: 12

Answer

$8x$

Work Step by Step

By using the FOIL method, we multiply the first, outside, inside, and the last element of each bracket and we add them. So, $(x+2)^2 - (x-2)^2=(x+2)\times (x+2) - (x-2)\times (x-2) = x^2+4x+4 - (x^2-4x+4) = 4x+4x = 8x$
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