यदि द्विघात समीकरण \(x^2-18x+k=0\) के मूल समान हैं, तो (k) क्या होगा?
If the roots of \(x^2-18x+k=0\) are equal, what is (k)?
Explanation opens after your attempt
Correct Answer
B. (81)
Concept
For equal roots, (D=0), so (324-4k=0) and (k=81). For equal roots, set the discriminant to zero.
Why this answer is correct
The correct answer is B. (81). For equal roots, (D=0), so (324-4k=0) and (k=81). For equal roots, set the discriminant to zero.
Exam Tip
समान मूलों के लिए (D=0), इसलिए (324-4k=0) और (k=81)। समान मूल की शर्त में विवेचक शून्य रखें।
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