यदि \(f:R\to R\), (f(x)=x-2-2x+3), तो (f) का परास क्या है?
If \(f:R\to R\), (f(x)=x-2-2x+3), what is the range of (f)?
Explanation opens after your attempt
A. \([2,\infty\))
Concept
Write (x-2-2x+3=(x-1)2+2).
Why this answer is correct
Since ((x-1)2\ge0), we have (f(x)\ge2).
Exam Tip
The minimum value is (2), so the range is \([2,\infty\)). चरण 1: (x-2-2x+3=(x-1)2+2) लिखें। चरण 2: ((x-1)2\ge0), इसलिए (f(x)\ge2)। चरण 3: न्यूनतम मान (2) है, इसलिए परास \([2,\infty\)) है।
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