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What is (k) for equal roots of (x^2-2(k+7)x+k^2=0)?(x^2-2(k+7)x+k^2=0) के समान मूलों के लिए (k) क्या होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (k=-\frac{7}{2})(k=-\frac{7}{2})
(D=4(k+7)^2-4k^2=0) gives ((k+7)^2=k^2), so (14k+49=0) and (k=-\frac{7}{2}). In exams, expand squares carefully.(D=4(k+7)^2-4k^2=0) से ((k+7)^2=k^2), इसलिए (14k+49=0) और (k=-\frac{7}{2}) है। परीक्षा में वर्ग फैलाते समय सावधानी रखें।
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