फलन (f(x)=\sqrt{x-2+8x+20}) की रेंज क्या है?
What is the range of (f(x)=\sqrt{x-2+8x+20})?
Explanation opens after your attempt
A. \([2,\infty\))
Concept
Inside, (x-2+8x+20=(x+4)2+4), so the minimum is (4). Taking square root gives the range \([2,\infty\)).
Why this answer is correct
The correct answer is A. \([2,\infty\)). Inside, (x-2+8x+20=(x+4)2+4), so the minimum is (4). Taking square root gives the range \([2,\infty\)).
Exam Tip
अंदर (x-2+8x+20=(x+4)2+4) है, इसलिए न्यूनतम (4) है। वर्गमूल लेने पर रेंज \([2,\infty\)) होगी।
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