Answer
$\pm3$
Work Step by Step
$\sqrt 9=\pm 3$
because,
$3\times3=9$
$-3\times-3=9$
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.