(x-4)(x+4) - x(x-2) = x² - 16 - x² + 2x = 2x - 16 = 2 * 2.5 - 16 = 5 - 16 = -9
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(x-4)(x+4) - x(x-2) = x² - 16 - x² + 2x = 2x - 16 = 2 * 2.5 - 16 = 5 - 16 = -9