(x-2-2(k+6)x+k-2=0) के समान मूलों के लिए (k) क्या होगा?
What is (k) for equal roots of (x-2-2(k+6)x+k-2=0)?
Explanation opens after your attempt
A. (k=-3)
Concept
(D=4(k+6)2-4k-2=0) gives ((k+6)2=k-2), so (12k+36=0) and (k=-3). In exams, expand squares carefully.
Why this answer is correct
The correct answer is A. (k=-3). (D=4(k+6)2-4k-2=0) gives ((k+6)2=k-2), so (12k+36=0) and (k=-3). In exams, expand squares carefully.
Exam Tip
(D=4(k+6)2-4k-2=0) से ((k+6)2=k-2), इसलिए (12k+36=0) और (k=-3) है। परीक्षा में वर्ग फैलाते समय सावधानी रखें।
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