\(4x^2+mx+25\) पूर्ण वर्ग हो तो (m) का धनात्मक मान क्या है?
If \(4x^2+mx+25\) is a perfect square, what is the positive value of (m)?
Explanation opens after your attempt
B. (20)
Concept
(4x-2=(2x)2) and \(25=5^2\). The middle term will be \(2\cdot2x\cdot5=20x\).
Why this answer is correct
The correct answer is B. (20). (4x-2=(2x)2) and \(25=5^2\). The middle term will be \(2\cdot2x\cdot5=20x\).
Exam Tip
(4x-2=(2x)2) और \(25=5^2\) हैं। मध्य पद \(2\cdot2x\cdot5=20x\) होगा।
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