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What is the expanded form of (x² − 9)(x² + 9)?(x² − 9)(x² + 9) का विस्तारित रूप क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: x⁴ − 81x⁴ − 81
Apply the identity (a − b)(a + b) = a² − b², with a = x² and b = 9. Thus, (x² − 9)(x² + 9) = (x²)² − 9² = x⁴ − 81, so option A is correct.पहचान (a − b)(a + b) = a² − b² लगाएँ, जहाँ a = x² और b = 9 हैं। इसलिए (x² − 9)(x² + 9) = (x²)² − 9² = x⁴ − 81, अतः विकल्प A सही है।
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