यदि (f(x)=x-2) और (g(x)=\frac{1}{x}) हैं, तो ((fg)(x)=x) का हल-समुच्चय क्या है?
If (f(x)=x-2) and (g(x)=\frac{1}{x}), what is the solution set of ((fg)(x)=x)?
Explanation opens after your attempt
A. \( \mathbb{R}-{0} \)
Concept
((fg)(x)=x-2\cdot\frac{1}{x}=x), but (x=0) is not in the domain. Hence every non-zero real number is a solution.
Why this answer is correct
The correct answer is A. \( \mathbb{R}-{0} \). ((fg)(x)=x-2\cdot\frac{1}{x}=x), but (x=0) is not in the domain. Hence every non-zero real number is a solution.
Exam Tip
((fg)(x)=x-2\cdot\frac{1}{x}=x), पर (x=0) डोमेन में नहीं है। अतः हर अशून्य वास्तविक संख्या हल है।
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