C. 9 और -9 / 9 and -9
ExplanationStep 1: This is difference of squares. Step 2: x² - 81 = (x-9)(x+9) so roots are 9 and -9. Step 3: Remember a²-b² = (a-b)(a+b).
Step 1: यह difference of squares है। Step 2: x² - 81 = (x-9)(x+9) इसलिए roots 9 और -9 हैं। Step 3: a²-b² = (a-b)(a+b) याद रखें।
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