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 $
$x+25=4x+40\Rightarrow 3x=-15\Rightarrow x=-5$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 4 - Inverse, Exponential, and Logarithmic Functions - 4.5 Exponential and Logarithmic Equations - 4.5 Exercises - Page 469: 59
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