$m=-6$ or $m=-7$
Work Step by Step
$x^2+13m=-42$ $x^2+13m+42=0$ $(m+6)(m+7)=0$ $m+6=0$ or $m+7=0$ $m=-6$ or $m=-7$
You can help us out by revising, improving and updating this answer.Update this answer
After 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.