Question

Which of the following correctly describes the domain of the function shown below?

r(x)=2x/(x²-1)

a. {x:x≠±1}
b.{x: all real numbers}
c.{x:x≠1}
d.{x:x≠0}

Answer 1

set the denominator = 0 and solve for x
you will get
\[x^2-1=0\]
\[x^2=1\]
\[x=\pm1\] so all real numbers except 1 and -1

Answer 2

wait so I'm confused which is it then?

Answer 3

A