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Let f: NvecR be a function defined as f(...

Let `f: NvecR` be a function defined as `f(x)=4x^2+12 x+15.` Show that `f: NvecS ,` where `S` is the range of `f,` is invertible. Also find the inverse of `f`

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The correct Answer is:
`fog = gof =I_(S)`
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