यदि \(\alpha=3+\sqrt{11}\) और \(\beta=3-\sqrt{11}\), तो \(\alpha^2+\beta^2\) क्या है?
If \(\alpha=3+\sqrt{11}\) and \(\beta=3-\sqrt{11}\), what is \(\alpha^2+\beta^2\)?
Explanation opens after your attempt
A. (40)
Concept
\(\alpha+\beta=6\) and \(\alpha\beta=9-11=-2\), so (\alpha-2+\beta-2=36-2(-2)=40). The identity (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta) is useful.
Why this answer is correct
The correct answer is A. (40). \(\alpha+\beta=6\) and \(\alpha\beta=9-11=-2\), so (\alpha-2+\beta-2=36-2(-2)=40). The identity (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta) is useful.
Exam Tip
\(\alpha+\beta=6\) और \(\alpha\beta=9-11=-2\), इसलिए (\alpha-2+\beta-2=36-2(-2)=40)। पहचान (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta) उपयोगी है।
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