8/3; -2
Объяснение:
(2х-1)(2х+1)-(х-3)(х+1)=18
4x^2-1-(x^2+x-3x-3) = 18
3x^2-2x - 16=0
D = b^2-4ac
D = 4+12*16 = 196
x1 = (2+14)/2*3 = 16/6 = 8/3
x2 = (2-14)/6 = -12/6 = -2
8/3; -2
Объяснение:
(2х-1)(2х+1)-(х-3)(х+1)=18
4x^2-1-(x^2+x-3x-3) = 18
3x^2-2x - 16=0
D = b^2-4ac
D = 4+12*16 = 196
x1 = (2+14)/2*3 = 16/6 = 8/3
x2 = (2-14)/6 = -12/6 = -2