यदि \(f:R\to R\), (f(x)=x-2+4x+7), तो (f) का परास क्या है?
If \(f:R\to R\), (f(x)=x-2+4x+7), what is the range of (f)?
Explanation opens after your attempt
A. \([3,\infty\))
Concept
Write (x-2+4x+7=(x+2)2+3).
Why this answer is correct
Since ((x+2)2\ge0), (f(x)\ge3).
Exam Tip
The minimum value is (3), so the range is \([3,\infty\)). चरण 1: (x-2+4x+7=(x+2)2+3) लिखें। चरण 2: ((x+2)2\ge0), इसलिए (f(x)\ge3)। चरण 3: न्यूनतम मान (3) है, अतः परास \([3,\infty\)) है।
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