f(x) = |x|


f(x) = |x| is a machine which accepts all kinds of numbers - positive, negative and 0

The positive numbers or 0, when enter the machine come out of it, without a change
But when the negative numbers enter the machine, they are multiplied with -1 so as to make them positive.

so, guess what happens when the input is "x"?

What sign is x?
What happens if x is positive?
and
What happens if x is negative?







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