(3х-1)*(х+2)=0 |7х-3|=4 Срочно!)

Question

(3х-1)*(х+2)=0
|7х-3|=4
Срочно!)

Answer 1

1. 3x^2 + 6x - x - 2 = 0
3x^2 + 5x - 2 = 0
D = b^2 - 4ac = 25 - 24 = 1
x1 = (-b + (корень квадратный)D) / 2a = (-5 + 1)  / 6 = -4/6 = -0.66
x2 = (-b - (корень квадратный)D) / 2a = -1

2. а) 7x - 3 = 4
7x = 4+3
7x = 7
x = 1

b) 7x - 3 = -4
7x = -4 + 3
7x = -1
x = - (1/7)
x = 0.14