Symbol
Problem
Find the domain and range of the following rational function. Use any notation. $1$ $f\left(x\right)=\dfrac {2} {x+1}$ $2$ $f\left(x\right)=\dfrac {3x} {x+3}$ $3.$ $f\left(x\right)=\dfrac {3-x} {x-7}$ $4$ $f\left(x\right)=\dfrac {2+x} {x}$ $5.f\left(x\right)=\dfrac {\left(x+1\right)} {x2-1}$