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Let QQ be the set of rational numbers, I...

Let `QQ` be the set of rational numbers, If `f: QQ rarr QQ` is defined by `f(x)=ax+b` , where a, b, `x in QQ ` and `a ne 0`, then show that f is invertible and hence find `f^(-1)`

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The correct Answer is:
`f^(-1)(x) =(x-b)/(a)`, for all `x in QQ`
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