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Consider f:R(+) to [-5, oo) given by f...

Consider `f:R_(+) to [-5, oo)` given by
`f(x)=9x^(2)+6x-5`. Show that f is invertible with `f^(-1)(y)= ((sqrt(y+6)-1)/(3))`. Hence. Find
`(i) f^(-1)(10)" " (ii) y" if "f^(-1)(y)=(4)/(3)`
where `R_(+)` is the set of all non-negative real numbers.

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