यदि \(x^2-5x-3=0\) की जड़ें \(\alpha,\beta\) हैं, तो \(\alpha^2+5\beta+\alpha\beta\) का मान क्या है?
If \(\alpha,\beta\) are roots of \(x^2-5x-3=0\), what is \(\alpha^2+5\beta+\alpha\beta\)?
Explanation opens after your attempt
C. (25)
Concept
Since \(\alpha\) is a root, \(\alpha^2=5\alpha+3\), and \(\alpha\beta=-3\). The expression becomes (5\alpha+3+5\beta-3=5\(\alpha+\beta\)=25).
Why this answer is correct
The correct answer is C. (25). Since \(\alpha\) is a root, \(\alpha^2=5\alpha+3\), and \(\alpha\beta=-3\). The expression becomes (5\alpha+3+5\beta-3=5\(\alpha+\beta\)=25).
Exam Tip
क्योंकि \(\alpha\) जड़ है, \(\alpha^2=5\alpha+3\) और \(\alpha\beta=-3\) है। व्यंजक (5\alpha+3+5\beta-3=5\(\alpha+\beta\)=25) बनता है।
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