#### Answer

$\color{blue}{4\sqrt{11b}-12a\sqrt{5}}$

#### Work Step by Step

Combine like terms to obtain:
$=(\sqrt{11b}+3\sqrt{11b})+(3a\sqrt{5}-15a\sqrt{5})
\\=(1+3)\sqrt{11b}+(3-15)a\sqrt{5}
\\=\color{blue}{4\sqrt{11b}-12a\sqrt{5}}$

Published by
Brooks Cole

ISBN 10:
0-53449-636-9

ISBN 13:
978-0-53449-636-4

$\color{blue}{4\sqrt{11b}-12a\sqrt{5}}$

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