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a - b = 5 এবং a²-b² = 15 হলে a ও b মূল বিশিষ্ট সমীকরণ -

x^{2} + 4 x + 3 = 0

x^{2} - 3 x - 4 = 0

x^{2} + 3 x + 5 = 0

x^{2} + 3 x - 4 = 0

ANS : 2

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