(t+3)(t-9) - t² = t² - 6t - 27 - t² = -6t - 27 = -3(2t + 9) = -3(28 + 9) = -3 * 37 = -111
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(t+3)(t-9) - t² = t² - 6t - 27 - t² = -6t - 27 = -3(2t + 9) = -3(28 + 9) = -3 * 37 = -111