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Let f : N to R be a function defined as...

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

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The correct Answer is:
`f^(-1)(x) =(sqrt(x-6)-3)/(2)`
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