#### Answer

$2\sqrt {5}-5\sqrt {3}+5\sqrt 7$

#### Work Step by Step

$\sqrt {20}-\sqrt {75}+5\sqrt 7$
=$\sqrt {4\times5}-\sqrt {25\times3}+5\sqrt 7$
=$(\sqrt 4\times \sqrt 5)-(\sqrt {25}\times\sqrt 3)+5\sqrt 7$
=$2\sqrt {5}-5\sqrt {3}+5\sqrt 7$

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$2\sqrt {5}-5\sqrt {3}+5\sqrt 7$

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.