Answer
$=198+54\sqrt 7$
Work Step by Step
$(2\sqrt21+4\sqrt 3)(5\sqrt 21-\sqrt 3)$
$=210-2\sqrt 63+20\sqrt 63-12$
$=210+18\sqrt 9.7$
$=198+54\sqrt 7$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 10 - Radical Expressions and Equations - Mid-Chapter Quiz - Page 632: 26
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