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Which of the following expressions is written as a difference of two squares?निम्नलिखित में से कौन-सा व्यंजक दो वर्गों के अंतर के रूप में लिखा गया है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(x^2-9\)\(x^2-9\)
\(x^2-9=x^2-3^2=(x-3)(x+3)\), so it is a difference of two squares. \(x^2+9\) is a sum of squares. Exam tip: look for \(a^2-b^2\).\(x^2-9=x^2-3^2=(x-3)(x+3)\), इसलिए यह दो वर्गों का अंतर है। \(x^2+9\) वर्गों का योग है। परीक्षा में \(a^2-b^2\) का रूप पहचानें।
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