⑴Y=-3(X-2)^2+9,抛物线开口向下,对称轴X=2,顶点坐标(2,9),
⑵Y=4(X-3)^2-10,抛物线开口向上,对称轴X=3,顶点坐标(3,-10),
⑶Y=2(X+2)^2-14,抛物线开口向上,对称轴X=-2,顶点坐标(-2,-14),
⑷Y=1/2(X-2)^2-3,抛物线开口向上,对称轴X=2,顶点坐标(2,-3). ⑴Y=-3(X-2)^2+9,抛物线开口向下,对称轴X=2,顶点坐标(2,9),
⑵Y=4(X-3)^2-10,抛物线开口向上,对称轴X=3,顶点坐标(3,-10),
⑶Y=2(X+2)^2-14,抛物线开口向上,对称轴X=-2,顶点坐标(-2,-14),
⑷Y=1/2(X-2)^2-3,抛物线开口向上,对称轴X=2,顶点坐标(2,-3).