решите 4 квадратных уравнения через дискриминант под знаками в) и г)

(3х - 1)(3х + 1) - 2х(1 + 4х) = -2,

9х - 1 - 2х - 8х = -2,

9х - 1 - 2х - 8х + 2 = 0,

х - 2х + 1 = 0,

Д = (-2) - 4*1*1 = 4 - 4 = 0,

х = 2 / 2*1 = 2/1 = 1,

(2х + 1) + 2 = 2 - 6х,

4х + 4х + 1 + 2 = 2 - 6х,

4х + 4х + 3 - 2 + 6х = 0,

10х + 4х + 1 = 0,

Д = 4 - 4*10*1 = 16 - 40 = - 24  --  корней нет,

(2х + х) / 5 = (4х - 2) / 3,

3*(2х + х) / 15 = 5*(4х - 2) / 15,

6х + 3х = 20х - 10,

6х - 17х + 10 = 0,

Д = (-17) - 4*6*10 = 289 - 240 = 49,

х1 = (17 + 7) / 2*6 = 24/12 = 2,

х2 = (17 - 7) / 2*6 = 10/12 = 5/6,

(4х + х) / 3  -  (5х - 1) / 6 = (х + 17) / 9,

6*(4х + х) / 18  -  3*(5х - 1) / 18 = 2*(х + 17) / 18,

24х + 6х - 15х + 3 = 2х + 34,

24х + 6х - 15х + 3 - 2х - 34 = 0,

22х - 9х - 31 = 0,

Д = (-9) - 4*22*(-31) = 81 + 2728 = 2809,

х1 = (9 + 53) / 2*22 = 62/44 = 31/22 = 1 9/22,

х2 = (9 - 53) / 2*22 = -44/44 = -1