Answer
$16-8\sqrt 7x +7x$
Work Step by Step
$(4-\sqrt 7x)(4-\sqrt 7x)$ Original problem
FOIL
$(4)(4)+(4)(-\sqrt 7x)+(4)(-\sqrt 7x)+(-\sqrt 7x)(-\sqrt 7x)$
Or
$16-4\sqrt 7x-4\sqrt 7x+7x$
Combine like terms
$16-8\sqrt 7x +7x$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.6 - Radical Equations and Problem Solving - Graphing Calculator Explorations - Page 452: 4
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