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Let A = {-1, 0, 1, 2, 3} and f: A rarrZ ...

Let A = {-1, 0, 1, 2, 3} and `f: A rarrZ` be given by `f(x)=x^2-5x+7,` where Z is the set of integers. Find
pre-images of 1, 4 and 7 under f.

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