# What is the domain and range of y= -x/( x^2-1)?

Domain is any real value except $x \ne \pm 1$
$y = - \frac{x}{{x}^{2} - 1}$
Domain (values of x) : ${x}^{2} - 1 \ne 0 \mathmr{and} {x}^{2} \ne 1 \mathmr{and} x \ne \pm 1$
Domain is any real value except $x \ne \pm 1$