यदि (f(x)=x+\frac{4}{x}), (x<0), तो (f) का परिसर चुनिए।
If (f(x)=x+\frac{4}{x}), (x<0), choose the range of (f).
Explanation opens after your attempt
A. (\(-\infty,-4]\)
Concept
For negative (x), put (x=-t), (t>0), then (f=-\(t+\frac{4}{t}\)\le -4). Hence the range is (\(-\infty,-4]\).
Why this answer is correct
The correct answer is A. (\(-\infty,-4]\). For negative (x), put (x=-t), (t>0), then (f=-\(t+\frac{4}{t}\)\le -4). Hence the range is (\(-\infty,-4]\).
Exam Tip
ऋणात्मक (x) के लिए (x=-t), (t>0), तब (f=-\(t+\frac{4}{t}\)\le -4)। इसलिए परिसर (\(-\infty,-4]\) है।
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