#### Answer

$ 5\sqrt 3$

#### Work Step by Step

$\sqrt {-5}\sqrt {-15} = \sqrt {-5 \times-15} = \sqrt {75} = \sqrt {25 \times 3} = 5\sqrt 3$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$ 5\sqrt 3$

$\sqrt {-5}\sqrt {-15} = \sqrt {-5 \times-15} = \sqrt {75} = \sqrt {25 \times 3} = 5\sqrt 3$

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