यदि \(x=\sqrt{5}+2\), तो \(\frac{1}{x}\) किसके बराबर है?
If \(x=\sqrt{5}+2\), then \(\frac{1}{x}\) is equal to which expression?
Explanation opens after your attempt
A. \(\sqrt{5}-2\)
Concept
Rationalizing gives \(\frac{1}{\sqrt{5}+2}\cdot\frac{\sqrt{5}-2}{\sqrt{5}-2}=\frac{\sqrt{5}-2}{5-4}=\sqrt{5}-2\). In exams, use the conjugate of the denominator.
Why this answer is correct
The correct answer is A. \(\sqrt{5}-2\). Rationalizing gives \(\frac{1}{\sqrt{5}+2}\cdot\frac{\sqrt{5}-2}{\sqrt{5}-2}=\frac{\sqrt{5}-2}{5-4}=\sqrt{5}-2\). In exams, use the conjugate of the denominator.
Exam Tip
\(\frac{1}{\sqrt{5}+2}\cdot\frac{\sqrt{5}-2}{\sqrt{5}-2}=\frac{\sqrt{5}-2}{5-4}=\sqrt{5}-2\)। परीक्षा में हर के संयुग्म का प्रयोग करें।
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