किस विकल्प में मूलों का योग धनात्मक और गुणनफल धनात्मक होगा?
In which option will the sum of roots be positive and the product of roots be positive?
Explanation opens after your attempt
Correct Answer
A. \(x^2-9x+20=0\)
Concept
In the first option, the sum is \(-\frac{b}{a}=9\) and the product is \(\frac{c}{a}=20\). So both are positive.
Why this answer is correct
The correct answer is A. \(x^2-9x+20=0\). In the first option, the sum is \(-\frac{b}{a}=9\) and the product is \(\frac{c}{a}=20\). So both are positive.
Exam Tip
पहले विकल्प में योग \(-\frac{b}{a}=9\) और गुणनफल \(\frac{c}{a}=20\) है। इसलिए दोनों धनात्मक हैं।
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