А) 3х^2 = 12
x^2 = 12:3 = 4
x = + - 4
б) 2х (x +3) = 0
x1 = 0
x2 = - 3
в) 1,8 x^2 = 0
x = 0
г) x^2 = - 9
Корней нет
д) 7х^2 = 14
x^2 = 14 : 7 = 2
x1 = Y2
x2 = - Y2
e) x(x -3) = 0
x1 = 0
x2 = 3
ж) х = 0
з) 6х^2 = -24
x^2 = - 4
Корней нет
и) 2х (5 + х) = 0
х1 = 0
х2 = - 5
к) 1/7 х^2 = - 6/7
x^2 = - 6
Корней нет
л) 5х^2 = 15
x^2 = 3
x1 = -Y3
x2 = Y3
м) 4,9х^2 = 0
x = 0