Свойства функции:
1) y=0.5x^2-2
2)y=x^2-4x+4
3)y=-x^2+2x

1 у = 00.5х^2 -2=00.5x^2= 2x^2 = 2:0.5x = √4x = 22. y = 0 x^2 - 4x+4 = 0D = 16 - 16 = 0x = 4 : 2 = 23. у = 0- х^2+2x = 0-x(x - 2) = 0x - 2 = 0x = 2