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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