यदि \(f:\mathbb{R}-{-3}\to\mathbb{R}\) तथा (f(x)=\frac{2x-1}{x+3}) हो तो (f(a)=f(b)) से क्या निष्कर्ष निकलेगा?
If \(f:\mathbb{R}-{-3}\to\mathbb{R}\) and (f(x)=\frac{2x-1}{x+3}), what conclusion follows from (f(a)=f(b))?
Explanation opens after your attempt
A. (a=b)
Concept
From (f(a)=f(b)), we get \(\frac{2a-1}{a+3}=\frac{2b-1}{b+3}\).
Why this answer is correct
Cross-multiplication gives (2ab+6a-b-3=2ab+6b-a-3), so (7a=7b).
Exam Tip
Hence (a=b), so the function is one-one. चरण 1: (f(a)=f(b)) से \(\frac{2a-1}{a+3}=\frac{2b-1}{b+3}\) मिलेगा। चरण 2: क्रॉस गुणा करने पर (2ab+6a-b-3=2ab+6b-a-3), इसलिए (7a=7b)। चरण 3: अतः (a=b) और फलन एकैकी है।
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