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 $
$x+25=4x+40\Rightarrow 3x=-15\Rightarrow x=-5$
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.