Hard Mathematics Polynomials Class 10 Level 26

यदि \(\alpha=2+\sqrt{7}\) और \(\beta=2-\sqrt{7}\), तो \(\alpha^2+\beta^2\) क्या है?

If \(\alpha=2+\sqrt{7}\) and \(\beta=2-\sqrt{7}\), what is \(\alpha^2+\beta^2\)?

Explanation opens after your attempt
Correct Answer

A. (22)

Step 1

Concept

\(\alpha+\beta=4\) and \(\alpha\beta=4-7=-3\). Thus (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta=16+6=22).

Step 2

Why this answer is correct

The correct answer is A. (22). \(\alpha+\beta=4\) and \(\alpha\beta=4-7=-3\). Thus (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta=16+6=22).

Step 3

Exam Tip

\(\alpha+\beta=4\) और \(\alpha\beta=4-7=-3\)। इसलिए (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta=16+6=22)।

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Mathematics Answer, Explanation and Revision Hints

यदि \(\alpha=2+\sqrt{7}\) और \(\beta=2-\sqrt{7}\), तो \(\alpha^2+\beta^2\) क्या है? / If \(\alpha=2+\sqrt{7}\) and \(\beta=2-\sqrt{7}\), what is \(\alpha^2+\beta^2\)?

Correct Answer: A. (22). Explanation: \(\alpha+\beta=4\) और \(\alpha\beta=4-7=-3\)। इसलिए (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta=16+6=22)। / \(\alpha+\beta=4\) and \(\alpha\beta=4-7=-3\). Thus (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta=16+6=22).

Which concept should I revise for this Mathematics MCQ?

\(\alpha+\beta=4\) and \(\alpha\beta=4-7=-3\). Thus (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta=16+6=22).

What exam hint can help solve this Mathematics question?

\(\alpha+\beta=4\) और \(\alpha\beta=4-7=-3\)। इसलिए (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta=16+6=22)।

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