यदि \(x=\sqrt{10}-\sqrt{2}\), तो \(x^2\) किसके बराबर है?

If \(x=\sqrt{10}-\sqrt{2}\), what is \(x^2\) equal to?

Explanation opens after your attempt
Correct Answer

A. \(12-4\sqrt{5}\)

Step 1

Concept

Use ((a-b)2=a-2-2ab+b-2).

Step 2

Why this answer is correct

\(x^2=10-2\sqrt{20}+2=12-4\sqrt{5}\).

Step 3

Exam Tip

In the middle term (-2ab), write both the sign and the surd carefully. चरण 1: ((a-b)2=a-2-2ab+b-2) लगाएँ। चरण 2: \(x^2=10-2\sqrt{20}+2=12-4\sqrt{5}\)। चरण 3: बीच वाले पद (-2ab) में चिह्न और मूल दोनों ध्यान से लिखें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(x=\sqrt{10}-\sqrt{2}\), तो \(x^2\) किसके बराबर है? / If \(x=\sqrt{10}-\sqrt{2}\), what is \(x^2\) equal to?

Correct Answer: A. \(12-4\sqrt{5}\). Explanation: चरण 1: ((a-b)2=a-2-2ab+b-2) लगाएँ। चरण 2: \(x^2=10-2\sqrt{20}+2=12-4\sqrt{5}\)। चरण 3: बीच वाले पद (-2ab) में चिह्न और मूल दोनों ध्यान से लिखें। / Step 1: Use ((a-b)2=a-2-2ab+b-2). Step 2: \(x^2=10-2\sqrt{20}+2=12-4\sqrt{5}\). Step 3: In the middle term (-2ab), write both the sign and the surd carefully.

Which concept should I revise for this Mathematics MCQ?

Use ((a-b)2=a-2-2ab+b-2).

What exam hint can help solve this Mathematics question?

In the middle term (-2ab), write both the sign and the surd carefully. चरण 1: ((a-b)2=a-2-2ab+b-2) लगाएँ। चरण 2: \(x^2=10-2\sqrt{20}+2=12-4\sqrt{5}\)। चरण 3: बीच वाले पद (-2ab) में चिह्न और मूल दोनों ध्यान से लिखें।