The domain of the function $$f(x) = \frac{x^2}{4-x^2}$$ is the set of all real numbers with two exceptions. The smaller exception is
$x=$ , and the larger is
$x=$ .
The range of $f$ is the set of all real numbers except those in the interval
, .
Hint: Observe that we can't divide by zero, and we can't take the square root of a negative number. To find the interval that's not in the range look for critical numbers.