29.17(а)
x^2 -3x + 2 = 0
D = 9 - 4(2) = 9 - 8 = 1; YD = 1
x1 = (3 + 1) / 2 = 2
x2 = (3 - 1) /2 = 1
x1= 2
x2 = 1
29.19 (f)
x^3 + 2x^2 + 3x + 6 = 0
(x^3 + 2x^2) + (3x + 6) = 0
x^2(x + 2) + 3(x + 2) = 0
(x^2 + 3) (x+ 2) = 0
x^2 + 3 = 0 или x + 2 = 0
x^2 = - 3 x = - 2