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Consider f:R+ rarr[-9,oo) given by f(x)=...

Consider `f:R_+ rarr[-9,oo)` given by `f(x)=5x^(2)+6x-9`, where `R_(+)` is the set of all non-negative real numbers. Prove that f is invertible. Also find the inverse of f. Hence find `f^(-1)(2)` and `f^(-1)(18)`.

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