a² - b² = (a - b)(a + b)
99.1² - 0.9² = (99.1 - 0.9)(99.1 + 0.9) = 98.2 * 100 = 9820
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a² - b² = (a - b)(a + b)
99.1² - 0.9² = (99.1 - 0.9)(99.1 + 0.9) = 98.2 * 100 = 9820