किस (k) के लिए \(x^2+kx+9\) पूर्ण वर्ग होगा और मध्य पद ऋण होगा?
For which (k) will \(x^2+kx+9\) be a perfect square with negative middle term?
Explanation opens after your attempt
D. (-6)
Concept
Since \(9=3^2\), the negative middle term is \(-2\cdot3\cdot x=-6x\). Exam tip: match the sign of the middle term with the condition.
Why this answer is correct
The correct answer is D. (-6). Since \(9=3^2\), the negative middle term is \(-2\cdot3\cdot x=-6x\). Exam tip: match the sign of the middle term with the condition.
Exam Tip
\(9=3^2\) है और ऋण मध्य पद \(-2\cdot3\cdot x=-6x\) होगा। परीक्षा में मध्य पद के चिह्न को शर्त से मिलाएं।
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