Answer
$9\sqrt{7}$
Work Step by Step
Simplify each radical, when needed, to have:
$=4\sqrt{7}-\sqrt{4(7)} + \sqrt{49(7)}
\\=4\sqrt{7} -2\sqrt{7} + 7\sqrt{7}$
Combine like terms to have:
$=(4-2+7)\sqrt{7}
\\=9\sqrt{7}$
Calculus with Applications (10th Edition)
by Lial, Margaret L.; Greenwell, Raymond N.; Ritchey, Nathan P.
Published by
Pearson
ISBN 10:
0321749006
ISBN 13:
978-0-32174-900-0
Chapter R - Algebra Reference - R.7 Radicals - R.7 Exercises - Page R-28: 11
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