एक कट-और-चिपकाओ मॉडल में \(x^2-14x+49\) को छोटे वर्ग में बदला गया। नए वर्ग की भुजा क्या है?
In a cut-and-paste model, \(x^2-14x+49\) is changed into a smaller square. What is the side of the new square?
Explanation opens after your attempt
Correct Answer
C. (x-7)reduced side
Concept
\(49=7^2\) and \(-14x=-2\cdot x\cdot7\), so the side is (x-7). In exams use both the middle term and the last term to identify a perfect square.
Why this answer is correct
The correct answer is C. (x-7) / reduced side. \(49=7^2\) and \(-14x=-2\cdot x\cdot7\), so the side is (x-7). In exams use both the middle term and the last term to identify a perfect square.
Exam Tip
\(49=7^2\) और \(-14x=-2\cdot x\cdot7\), इसलिए भुजा (x-7) है। परीक्षा में पूर्ण वर्ग पहचानने के लिए मध्य पद और अंतिम पद दोनों देखें।
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