#### Answer

Geometric sequence
$r=-\sqrt {5}$

#### Work Step by Step

$\dfrac {-25}{5\sqrt {5}}=\dfrac {5\sqrt {5}}{-5}=\dfrac {-5}{\sqrt {5}}=\dfrac {\sqrt {5}}{-1}=-\sqrt {5}\Rightarrow r=-\sqrt {5}$
Then this is geometric sequence

Published by
Pearson

ISBN 10:
013421742X

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

Geometric sequence
$r=-\sqrt {5}$

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