JEE MATHEMATICS MCQ: FUNCTIONS

1 Easy

1 of 1

Analyzing +4 | -1

f\left( x \right) = \frac{{\alpha x}}{{x + 1}},\;x \ne - 1

, for what value of α is

f\left[ {f\left( x \right)} \right] = x

View answer and explanation

Correct option: D

-1

The correct answer is D (-1) because when α = -1, f[f(x)] simplifies to x, satisfying the given condition.

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