Q. 425.0( 1 Vote )

Mark the correct A. [2, ∞)

B. (–∞, 2]

C. (–∞, 4]

D. [4, ∞)

Answer :

Given that f: [2, ∞) X be defined by


f(x) = 4x – x2


Let y = f(x)


y = 4x – x2


-y + 4 = 4 - 4x + x2


4 – y = (x – 2)2




So,


where x < 4


So, x ϵ (–∞, 4]

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