Let `f : N to X : f(x) =4x^(2) +12x +15 . " Then " f^(-1)(y)=?`A. `(1) – InterviewSolution

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1.	Let `f : N to X : f(x) =4x^(2) +12x +15 . " Then " f^(-1)(y)=?`A. `(1)/(2) (sqrt(y-4+)+3)`B. `(1)/(2) (sqrt(y-6)-3)`C. `(1)/(2) (sqrt(y-4)+5)`D. none of these
Answer» Correct Answer - B `y=4x^(2) +12x + 15 =(2x+3)^(2)+6 rArr x=(1)/(2) (sqrt(y-6)-3)` `:. , f^(-1) (y) =(1)/(2) (sqrt(y-6)-3)`

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