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Which of the following quadratic expressions can be factorised using the identityनिम्नलिखित में से कौन-सा द्विघात व्यंजक
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(x^2-49\)\(x^2-49\)
\(x^2-49=x^2-7^2\) is a difference of two squares, so it factorises as \((x+7)(x-7)\). Options C and D are perfect-square trinomials. Exam tip: first check for a missing middle \(x\)-term.\(x^2-49=x^2-7^2\) दो वर्गों का अंतर है, इसलिए \((x+7)(x-7)\) होगा। विकल्प C और D पूर्ण-वर्ग त्रिपद हैं। परीक्षा टिप: बीच में \(x\) वाला पद न हो तो वर्गों का अंतर जाँचें।
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