(1)开口向上,对称轴x=1,顶点坐标为(1,0)
(2)y=2x^2-4x-1=2(x-1)^2-3开口向上,对称轴x=1,顶点坐标为(1,-3)
(3)y=3x^2-6x+2=3(x-1)^2-1开口向上,对称轴x=1,顶点坐标为(1,-1)
(4)y=(x+1)(x-2)=(x-1/2)^2-9/4开口向上,对称轴x=1/2,顶点坐标为(1/2,-9/4)
(5)y=-3(x+3)(x+9)=-3(x+6)^2+27开口向下,对称轴x=-6,顶点坐标为(-6,27)
(1)开口向上,对称轴x=1,顶点坐标为(1,0)
(2)y=2x^2-4x-1=2(x-1)^2-3开口向上,对称轴x=1,顶点坐标为(1,-3)
(3)y=3x^2-6x+2=3(x-1)^2-1开口向上,对称轴x=1,顶点坐标为(1,-1)
(4)y=(x+1)(x-2)=(x-1/2)^2-9/4开口向上,对称轴x=1/2,顶点坐标为(1/2,-9/4)
(5)y=-3(x+3)(x+9)=-3(x+6)^2+27开口向下,对称轴x=-6,顶点坐标为(-6,27)