एक वर्ग मॉडल का क्षेत्रफल \(x^2+14x+49\) है। यदि बाहरी भुजा (x+k) है, तो (k) क्या होगा?
The area of a square model is \(x^2+14x+49\). If the outer side is (x+k), what is (k)?
Explanation opens after your attempt
C. (7)
Concept
\(49=7^2\) and \(2\cdot x\cdot 7=14x\), so (k=7). Exam tip: check both square root of last term and middle term.
Why this answer is correct
The correct answer is C. (7). \(49=7^2\) and \(2\cdot x\cdot 7=14x\), so (k=7). Exam tip: check both square root of last term and middle term.
Exam Tip
\(49=7^2\) और \(2\cdot x\cdot 7=14x\), इसलिए (k=7)। परीक्षा में अंतिम पद का वर्गमूल और मध्य पद दोनों जाँचें।
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