1) 2x^2 - 8 = x^2 - 16 + x^2 - 9
-x^2 = -17
x^2 = 17
2) 3(х+1)(х-1)=2(х-2)(х+2)+Х^2+2х
3x^2 - 1 = 2x^2 - 8 + x^2 + 2x
-2x = 1 - 8
-2x = - 7
x = 3.5
1) 2x^2 - 8 = x^2 - 16 + x^2 - 9
-x^2 = -17
x^2 = 17
2) 3(х+1)(х-1)=2(х-2)(х+2)+Х^2+2х
3x^2 - 1 = 2x^2 - 8 + x^2 + 2x
-2x = 1 - 8
-2x = - 7
x = 3.5