यदि \(y=\sqrt{14}-\sqrt{7}\) है, तो \(y^2\) का सरल मान कौन-सा है?

If \(y=\sqrt{14}-\sqrt{7}\), which is the simplified value of \(y^2\)?

Author: Muft Shiksha Editorial Team Published:
Explanation opens after your attempt
Correct Answer

A. \(21-14\sqrt{2}\)

Step 1

Concept

(\(\sqrt{14}-\sqrt{7}\)2=14+7-2\sqrt{98}). Since \(\sqrt{98}=7\sqrt{2}\), the answer is \(21-14\sqrt{2}\).

Step 2

Why this answer is correct

The correct answer is A. \(21-14\sqrt{2}\). (\(\sqrt{14}-\sqrt{7}\)2=14+7-2\sqrt{98}). Since \(\sqrt{98}=7\sqrt{2}\), the answer is \(21-14\sqrt{2}\).

Step 3

Exam Tip

(\(\sqrt{14}-\sqrt{7}\)2=14+7-2\sqrt{98}) है। \(\sqrt{98}=7\sqrt{2}\), इसलिए उत्तर \(21-14\sqrt{2}\) है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(y=\sqrt{14}-\sqrt{7}\) है, तो \(y^2\) का सरल मान कौन-सा है? / If \(y=\sqrt{14}-\sqrt{7}\), which is the simplified value of \(y^2\)?

Correct Answer: A. \(21-14\sqrt{2}\). Explanation: (\(\sqrt{14}-\sqrt{7}\)2=14+7-2\sqrt{98}) है। \(\sqrt{98}=7\sqrt{2}\), इसलिए उत्तर \(21-14\sqrt{2}\) है। / (\(\sqrt{14}-\sqrt{7}\)2=14+7-2\sqrt{98}). Since \(\sqrt{98}=7\sqrt{2}\), the answer is \(21-14\sqrt{2}\).

Which concept should I revise for this Mathematics MCQ?

(\(\sqrt{14}-\sqrt{7}\)2=14+7-2\sqrt{98}). Since \(\sqrt{98}=7\sqrt{2}\), the answer is \(21-14\sqrt{2}\).

What exam hint can help solve this Mathematics question?

(\(\sqrt{14}-\sqrt{7}\)2=14+7-2\sqrt{98}) है। \(\sqrt{98}=7\sqrt{2}\), इसलिए उत्तर \(21-14\sqrt{2}\) है।