\(x^2+mx+49\) पूर्ण वर्ग है और (m) धनात्मक है। (m) का मान क्या होगा?
\(x^2+mx+49\) is a perfect square and (m) is positive. What will be the value of (m)?
Explanation opens after your attempt
Correct Answer
B. (14)
Concept
\(49=7^2\), so the middle term is \(2\cdot x\cdot7=14x\). In exams, take the positive middle coefficient for a positive perfect square.
Why this answer is correct
The correct answer is B. (14). \(49=7^2\), so the middle term is \(2\cdot x\cdot7=14x\). In exams, take the positive middle coefficient for a positive perfect square.
Exam Tip
\(49=7^2\) है इसलिए मध्य पद \(2\cdot x\cdot7=14x\) होगा। परीक्षा में धनात्मक पूर्ण वर्ग के लिए धनात्मक मध्य गुणांक लें।
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