(x-2-2(k+2)x+k-2=0) के समान मूलों के लिए (k) क्या होगा?
What is (k) for equal roots of (x-2-2(k+2)x+k-2=0)?
Explanation opens after your attempt
A. (k=-1)
Concept
(D=4(k+2)2-4k-2=0) gives ((k+2)2=k-2), so (4k+4=0) and (k=-1). In exams, expand squares carefully.
Why this answer is correct
The correct answer is A. (k=-1). (D=4(k+2)2-4k-2=0) gives ((k+2)2=k-2), so (4k+4=0) and (k=-1). In exams, expand squares carefully.
Exam Tip
(D=4(k+2)2-4k-2=0) से ((k+2)2=k-2), इसलिए (4k+4=0) और (k=-1) है। परीक्षा में वर्ग फैलाते समय सावधानी रखें।
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