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[" SECTION "C],[" estion numbers "27" to "32" carry "4" marks each."],[" 27.Consider "f:R_(+)rarr(-9,oo)" given by "f(x)=5x^(2)+6x-9" .Prove that "f" is invertible with "f^(-1)(y)=((sqrt(54)+5y-3)/(5))]

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