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Which of the following trinomials is a perfect square of a binomial?निम्नलिखित में से कौन-सा त्रिपद किसी द्विपद का पूर्ण वर्ग है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(9p^2-24pq+16q^2\)\(9p^2-24pq+16q^2\)
Here, \(9p^2=(3p)^2\) and \(16q^2=(4q)^2\). The middle term is \(-2\times3p\times4q=-24pq\), so A equals \((3p-4q)^2\). Exam tip: check whether the middle term is \(\pm2ab\).\(9p^2=(3p)^2\) और \(16q^2=(4q)^2\) हैं। मध्य पद \(-2\times3p\times4q=-24pq\) है, इसलिए A, \((3p-4q)^2\) है। परीक्षा टिप: मध्य पद को \(\pm2ab\) से मिलाएँ।
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