Answer
(z+1)($z^{2}$+7)
Work Step by Step
$z^{3}$+7z+$z^{2}$+7=
z($z^{2}$+7)+1($z^{2}$+7)=
(z+1)($z^{2}$+7)
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.