यदि \(f:\mathbb{R}\setminus{1}\to\mathbb{R}\setminus{2}\), (f(x)=\frac{2x+3}{x-1}) है, तो (f) के आच्छादी होने के लिए (x) का रूप क्या होगा?
If \(f:\mathbb{R}\setminus{1}\to\mathbb{R}\setminus{2}\), (f(x)=\frac{2x+3}{x-1}), what form of (x) shows that (f) is onto?
Correct answer and explanation
A. \(x=\frac{y+3}{y-2}\)
Concept
\(\frac{2x+3}{x-1}=y\) रखें। / Put \(\frac{2x+3}{x-1}=y\).
Why this answer is correct
(2x+3=xy-y), इसलिए (x(y-2)=y+3) और \(x=\frac{y+3}{y-2}\)। / Then (2x+3=xy-y), so (x(y-2)=y+3) and \(x=\frac{y+3}{y-2}\).
Exam Tip
चूंकि सहप्रांत में (y=2) नहीं है, यह पूर्वप्रतिबिंब मान्य रहता है। / Since (y=2) is not in the codomain, this preimage is valid.
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