यदि \(x=3+\sqrt{8}\), तो \(\frac{1}{x}\) किसके बराबर है?
If \(x=3+\sqrt{8}\), what is \(\frac{1}{x}\) equal to?
Explanation opens after your attempt
Correct Answer
A. \(3-\sqrt{8}\)
Concept
Because (\(3+\sqrt{8}\)\(3-\sqrt{8}\)=9-8=1), the reciprocal is \(3-\sqrt{8}\). If the product is (1), the reciprocal is immediate.
Why this answer is correct
The correct answer is A. \(3-\sqrt{8}\). Because (\(3+\sqrt{8}\)\(3-\sqrt{8}\)=9-8=1), the reciprocal is \(3-\sqrt{8}\). If the product is (1), the reciprocal is immediate.
Exam Tip
क्योंकि (\(3+\sqrt{8}\)\(3-\sqrt{8}\)=9-8=1), इसलिए व्युत्क्रम \(3-\sqrt{8}\) है। परीक्षा में गुणनफल (1) होने पर व्युत्क्रम तुरंत मिल जाता है।
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