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Which of the following trinomials can be written as the square of a binomial?निम्नलिखित में से कौन-सा त्रिपद किसी द्विपद के वर्ग के रूप में लिखा जा सकता है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(x^2+14x+49\)\(x^2+14x+49\)
In \(x^2+14x+49\), the last term is \(49=7^2\) and the middle term is \(14x=2\cdot x\cdot7\). Hence it is \((x+7)^2\). In exams, always check whether the middle term equals \(2ab\).\(x^2+14x+49\) में अंतिम पद \(49=7^2\) है और मध्य पद \(14x=2\cdot x\cdot7\) है। इसलिए यह \((x+7)^2\) है। परीक्षा में मध्य पद को \(2ab\) से अवश्य मिलाएँ।
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