3х²-4х-1 = 0
D = (-4)²-4*3*(-1) = 16+12 = 28 = (2√7)²
x1 = (4+2√7)/(2*3) = (2+√7)/3
x2 = (4-2√7)/(2*3) = (2-√7)/3
3х²-4х-1 = 0
D = (-4)²-4*3*(-1) = 16+12 = 28 = (2√7)²
x1 = (4+2√7)/(2*3) = (2+√7)/3
x2 = (4-2√7)/(2*3) = (2-√7)/3