यदि \(x=1-\sqrt{5}\), तो \(x^2-2x-4\) का मान क्या है?
If \(x=1-\sqrt{5}\), what is the value of \(x^2-2x-4\)?
Explanation opens after your attempt
A. (0)
Concept
Since \(x-1=-\sqrt{5}\), ((x-1)2=5), so \(x^2-2x-4=0\). Isolate the irrational part and square in exams.
Why this answer is correct
The correct answer is A. (0). Since \(x-1=-\sqrt{5}\), ((x-1)2=5), so \(x^2-2x-4=0\). Isolate the irrational part and square in exams.
Exam Tip
\(x-1=-\sqrt{5}\), इसलिए ((x-1)2=5) से \(x^2-2x-4=0\) मिलता है। परीक्षा में अपरिमेय भाग अलग करके वर्ग करें।
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