Q145 of 99 Page 59

Mark (√) against the correct answer in the following:

Let f : N → X : f(x) = 4x2 + 12x + 15. Then, f - 1(y) = ?


f(x) = 4x2 + 12x + 15


⇒y = 4x2 + 12x + 15


⇒y = (2x + 3)2 + 6


⇒√(y - 6) = 2x + 3


⇒


f - 1(y) =

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