# CAT Quantitative Aptitude Questions | CAT Algebra - Functions questions

###### CAT Questions | Algebra | Functions - Invertible Functions CAT Questions

The question is about Invertible Functions. We need to find out the value of the x for which the function and the inverse function is equal. Functions is a simple topic which involves a lot of basic ideas. Make sure that you a get of hold of them by solving these questions. A range of CAT questions can be asked based on this simple concept of Functions questions in the CAT Exam. Make sure you practice a lot of questions in CAT Functions Algebra to push your CAT preparation in the right direction. Functions as an idea is a fabulous idea if one can wrap their head around it the right way, and it has been one of the staple ideas tested by the CAT exam historically.

Question 19: If f(x) = $$frac{$x + 6$}{(x+2)}$. Find the value of x for which f$x) = f-1(x)?

1. -3
2. 2
3. Both A and B
4. None of these

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##### Method of solving this CAT Question from CAT Algebra - Functions: When will we have an invertible function ?

f(x) = f-1(x) when f(x) = x

=> $$frac{$x + 6$}{(x+2)}$ = x => x + 6 = x2 + 2x => x2 + x – 6 = 0 =>$x+3) (x-2) = 0
=> x = -3, 2

The question is "Find the value of x for which f(x) = f-1(x)?"

##### Hence the answer is "Both A and B"

Choice C is the correct answer.

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