y=x^4-4x^3-8x^2-3
x2 - 6x + 1 = 0D = b2 - 4acD = 36 - 4 = 32 = (4√2)^2x1,2 = -b ± √D/2ax1 = 6 + 4√2/2= 3 + 2√2x2 = 6 - 4√2/2 = 3 - 2√2Ответ: x1 = 3 + 2√2 ; x2 = 3 - 2√2