Published by:
CGP EDU Academic Team
Published on: August 13, 2026
If the function f:[1 , ∞] → → [1, ∞) is defined by f(x) = 2 x (x − − 1) , then f − − 1 (x) is (1999 – 2Marks)
A
(1/2) x(x − − 1)
B
C
D
Not defined
Text Solution
Verified by ExpertsThe correct answer is:
B
y = 2 x(x − − 1) ⇒ ⇒ x 2 – x – log 2 y = 0; 
Since x is + ive, we choose only + out of 
∴ ∴ 
or 
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