# What is the domain of f(x)=(x^2+2x)/(x^2-4)?

The function $f \left(x\right) = \frac{{x}^{2} + 2 x}{{x}^{2} - 4}$
${x}^{2} - 4$ to be $= 0$
That is, the domain of $f \left(x\right)$