domain: $(-\infty,\infty)$. range: $(-\infty,\infty)$.
Work Step by Step
$f(x)=4-x$ the function has a zero at x=4 //x<4 f(2)=2 //x>4 f(5)=-1 as f(x) exists for all values of x, the domain and the range is $(-\infty,\infty)$.
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