x2 - 2x - 1 = 0 D = b2 - 4ac D = 4 + 4 = 8 = (2√2) x1,2 = -b ± √D/2a x1 = 2 + 2√2/2= 1 + √2 x2 = 2 - 2√2/2= 1 - √2 Ответ: x1 = 1 + √2 ; x2 = 1 - √2