यदि \(x=2+\sqrt{5}\), तो \(x^2-4x-1\) का मान क्या होगा?

If \(x=2+\sqrt{5}\), what is the value of \(x^2-4x-1\)?

Explanation opens after your attempt
Correct Answer

A. (0)

Step 1

Concept

Since \(x-2=\sqrt{5}\), squaring gives ((x-2)2=5), so \(x^2-4x-1=0\). In exams square to remove the radical.

Step 2

Why this answer is correct

The correct answer is A. (0). Since \(x-2=\sqrt{5}\), squaring gives ((x-2)2=5), so \(x^2-4x-1=0\). In exams square to remove the radical.

Step 3

Exam Tip

\(x-2=\sqrt{5}\), इसलिए ((x-2)2=5) से \(x^2-4x-1=0\) मिलता है। परीक्षा में वर्ग करके अपरिमेय हटाएं।

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Mathematics Answer, Explanation and Revision Hints

यदि \(x=2+\sqrt{5}\), तो \(x^2-4x-1\) का मान क्या होगा? / If \(x=2+\sqrt{5}\), what is the value of \(x^2-4x-1\)?

Correct Answer: A. (0). Explanation: \(x-2=\sqrt{5}\), इसलिए ((x-2)2=5) से \(x^2-4x-1=0\) मिलता है। परीक्षा में वर्ग करके अपरिमेय हटाएं। / Since \(x-2=\sqrt{5}\), squaring gives ((x-2)2=5), so \(x^2-4x-1=0\). In exams square to remove the radical.

Which concept should I revise for this Mathematics MCQ?

Since \(x-2=\sqrt{5}\), squaring gives ((x-2)2=5), so \(x^2-4x-1=0\). In exams square to remove the radical.

What exam hint can help solve this Mathematics question?

\(x-2=\sqrt{5}\), इसलिए ((x-2)2=5) से \(x^2-4x-1=0\) मिलता है। परीक्षा में वर्ग करके अपरिमेय हटाएं।