Answer
$(-\infty,\infty)$.
Work Step by Step
Given $f(x)=\frac{-2}{x^2+7}$, as $x^2\geq0, x^2+7\geq7$, we can find its domain as $(-\infty,\infty)$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 4 - Inverse, Exponential, and Logarithmic Functions - Summary Exercises on Functions: Domains and Defining Equations - Exercises - Page 486: 5
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