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Which of the following trinomials is not a perfect square trinomial?निम्नलिखित में से कौन-सा त्रिपद पूर्ण वर्ग त्रिपद नहीं है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(x^2+12x+25\)\(x^2+12x+25\)
In \(x^2+12x+25\), the square roots of the first and last terms are \(x\) and \(5\), so the middle term should be \(2\times x\times5=10x\), not \(12x\). Exam tip: always check the middle term using \(2ab\).\(x^2+12x+25\) में पहले और अंतिम पदों के वर्गमूल \(x\) तथा \(5\) हैं, इसलिए मध्य पद \(2\times x\times5=10x\) होना चाहिए, \(12x\) नहीं। परीक्षा टिप: मध्य पद को \(2ab\) से मिलाएँ।
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