Find the domain and range of f(x)=-x and f(x)=in root y^2-9

1.	Find the domain and range of f(x)=-x and f(x)=in root y^2-9
Answer» Yes it is?? f (x)=\|-x\|Domain=all real no.Range=all positive real no.or[0, infinity) It\'s \|-x\| not -x.

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