Answer
All values must be included.
Work Step by Step
The given expression is
$=\frac{x}{x^2+9} $
(a) Substitute $x=3$.
$=\frac{3}{3^2+9} $
Simplify.
$=\frac{3}{9+9} $
$=\frac{3}{18} $
$=\frac{1}{6} $
(b) Substitute $x=1$.
$=\frac{1}{1^2+9} $
Simplify.
$=\frac{1}{1+9} $
$=\frac{1}{10} $
(c) Substitute $x=0$.
$=\frac{0}{0^2+9} $
Simplify.
$=\frac{0}{0+9} $
$=\frac{0}{9} $
$=0 $
(d) Substitute $x=-1$.
$=\frac{-1}{(-1)^2+9} $
Simplify.
$=\frac{-1}{1+9} $
$=\frac{-1}{10} $
$=-\frac{1}{10} $
Hence, all values must be included.
