#### Answer

$-5$

#### Work Step by Step

$\log \left( x+25\right) =\log \left( x+10\right) +\log 4\Rightarrow \log \left( x+25\right) =\log \left[ \left( x+10\right) \times 4\right] \Rightarrow $
$x+25=4x+40\Rightarrow 3x=-15\Rightarrow x=-5$

Published by
Pearson

ISBN 10:
013421742X

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

$-5$

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