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## Main Question or Discussion Point

I don't get this problem and why the answer is what the book states that it should be:

If [tex]f(x)=\sqrt{x^{2}}[/tex] then f(x) can also be expressed as: l x l

The answer I chose was simply x , but I don't know why it is wrong.

If [tex]f(x)=\sqrt{x^{2}}[/tex] then f(x) can also be expressed as: l x l

The answer I chose was simply x , but I don't know why it is wrong.