দেওয়া আছে, a + b = 7 ও ab = 10
আমরা জানি, (a + b) = 7
বা, (a + b)2 = 72
বা, (a - b)2 + 4ab = 49
বা, (a - b)2 + 4 × 10 = 49
বা, (a - b)2 = 49 - 40 = 9
∴ a - b = 3
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