Ответы на вопрос:
4x² - 3x - 1 = ( x + 1)² 4x² - 3x - 1 = x² + 2x + 1 4x² - x² - 3x - 2x - 1 - 1 =0 3x² - 5x - 2 = 0 d = b² - 4ac = 25 - 4×3×(-2) = 25 + 24 = 49= 7² x1 = ( 5 + 7) / 6 = 2 x2 = ( 5 - 7) / 6 = - 2/6 = - 1/3
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