यदि \(x^2-8x+n=0\) की जड़ें \(\alpha,\beta\) हैं और \(\alpha^2+\beta^2=40\), तो (n) का मान क्या है?
If \(\alpha,\beta\) are the roots of \(x^2-8x+n=0\) and \(\alpha^2+\beta^2=40\), what is the value of (n)?
Explanation opens after your attempt
B. (12)
Concept
Here \(\alpha+\beta=8\) and \(\alpha\beta=n\). From \(\alpha^2+\beta^2=64-2n=40\), we get (n=12).
Why this answer is correct
The correct answer is B. (12). Here \(\alpha+\beta=8\) and \(\alpha\beta=n\). From \(\alpha^2+\beta^2=64-2n=40\), we get (n=12).
Exam Tip
\(\alpha+\beta=8\) और \(\alpha\beta=n\) है। \(\alpha^2+\beta^2=64-2n=40\) से (n=12) मिलता है।
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