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Which of the following quadratic expressions can be written as the perfect square of a binomial?निम्नलिखित में से कौन-सा द्विघात व्यंजक किसी द्विपद के पूर्ण वर्ग के रूप में लिखा जा सकता है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(x^2+10x+25\)\(x^2+10x+25\)
\(x^2+10x+25=x^2+2\cdot x\cdot5+5^2=(x+5)^2\), so A is a perfect square. In B, the constant term would need to be \(25\). Exam tip: match the middle term with \(2ab\).\(x^2+10x+25=x^2+2\cdot x\cdot5+5^2=(x+5)^2\), इसलिए A पूर्ण वर्ग है। B का स्थिर पद \(25\) होना चाहिए था। परीक्षा टिप: मध्य पद को \(2ab\) से मिलाएँ।
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