Answer
$(-∞,∞)$
Work Step by Step
Since no number can make this function undefined, the domain includes all real numbers.
$f(x)=x^2-2x-15$
$f(x)=(x+3)(x-5)$
$(-∞,∞)$
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.