फलन (f(x)=\sqrt{x-2+4x+7}) का परिसर क्या है?
What is the range of (f(x)=\sqrt{x-2+4x+7})?
Explanation opens after your attempt
A. \( [\sqrt{3},\infty\) )
Concept
Since (x-2+4x+7=(x+2)2+3), the inside minimum is (3). Taking the square root gives the minimum \(\sqrt{3}\).
Why this answer is correct
The correct answer is A. \( [\sqrt{3},\infty\) ). Since (x-2+4x+7=(x+2)2+3), the inside minimum is (3). Taking the square root gives the minimum \(\sqrt{3}\).
Exam Tip
(x-2+4x+7=(x+2)2+3), इसलिए अंदर का न्यूनतम (3) है। वर्गमूल लेने पर न्यूनतम \(\sqrt{3}\) मिलेगा।
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