Answer
$ x=-12$
Work Step by Step
We solve by factoring:
$x^{2}+24x+144=0$
$(x+12)(x+12)=0$
$(x+12)^{2}=0$
$ x+12=0$
$ x=-12$
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.