यदि \(x^2-9x+n=0\) की जड़ें \(\alpha,\beta\) हैं और \(\alpha^2+\beta^2=45\), तो (n) का मान क्या है?
If \(\alpha,\beta\) are the roots of \(x^2-9x+n=0\) and \(\alpha^2+\beta^2=45\), what is the value of (n)?
Explanation opens after your attempt
B. (18)
Concept
Here \(\alpha+\beta=9\) and \(\alpha\beta=n\). From (81-2n=45), we get (n=18).
Why this answer is correct
The correct answer is B. (18). Here \(\alpha+\beta=9\) and \(\alpha\beta=n\). From (81-2n=45), we get (n=18).
Exam Tip
\(\alpha+\beta=9\) और \(\alpha\beta=n\) है। (81-2n=45) से (n=18) मिलता है।
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