Question

Find the domain and range of f(x)=2/(x^2-2x-3)

Answer 1

the domain is (−∞,−1)∪(−1,3)∪(3,∞)
{x|x≠−1,3}

Answer 2

the range is (−∞,−12]∪(0,∞)
{y|y≤−12,y>0}

Answer 3

Refer to the attached plot.