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

Explanation

`f(x)=4 x^{2}+12 x+15`


For onto: -


`y =4 x^{2}+12 x+15 `


`4 x^{2}+12 x+(15-y) \geq 0 `

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