फलन (f(x)=\sqrt{18-2x-x-2}) का डोमेन क्या है?
What is the domain of (f(x)=\sqrt{18-2x-x-2})?
Explanation opens after your attempt
A. \([-1-\sqrt{19},-1+\sqrt{19}]\)
Concept
The square root needs \(18-2x-x^2\ge0\). This is a downward quadratic, so the closed interval between the roots is the domain.
Why this answer is correct
The correct answer is A. \([-1-\sqrt{19},-1+\sqrt{19}]\). The square root needs \(18-2x-x^2\ge0\). This is a downward quadratic, so the closed interval between the roots is the domain.
Exam Tip
वर्गमूल के लिए \(18-2x-x^2\ge0\) चाहिए। यह downward quadratic है इसलिए roots के बीच वाला बंद अंतराल डोमेन है।
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