3x^2 + 2x -1
3x^2 + 2x - 1 = 0
D = b^2 - 4ac = 2^2 -4*3*(-1) = 4 + 12 = 16 > 0
x_1 = (-b + VD)/2a = (-2 + v16)/2*3 = (-2 + 4)/6 = 2/6 = 1/3
x_2 = (-b - VD)/2a = (-2 - 4)/6 = -6/6 = -1
3x^2 + 2x - 1 = 3*(x - x_1)*(x - x_2) = 3*(x - 1/3)*(x - (-1)) = (3x - 1)*(x + 1)
Ответ. (3х - 1)*(х + 1)