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Give a counterexample to show: a given function is not one-to-one and onto: a: R->R where...

Give a counterexample to show: a given function is not one-to-one and onto: a: R->R where a(x) = x^2 -2x-1 for all x in R.

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Hence a is not onto as -4 does not have preimage under a.

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