यदि \(x^2-2rx+9=0\) के मूल समान हैं तो \(r^2\) का मान क्या होगा?
If the roots of \(x^2-2rx+9=0\) are equal, what will be the value of \(r^2\)?
Explanation opens after your attempt
A. (9)
Concept
For equal roots (D=0), so ((-2r)2-4(1)(9)=0). This gives \(r^2=9\).
Why this answer is correct
The correct answer is A. (9). For equal roots (D=0), so ((-2r)2-4(1)(9)=0). This gives \(r^2=9\).
Exam Tip
समान मूलों के लिए (D=0) है इसलिए ((-2r)2-4(1)(9)=0)। इससे \(r^2=9\) मिलता है।
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