一道画图题,在同一直角坐标系中画出函数y=-2x平方,y=-2(x-3)平方,y=-2(x+3)平方,y=-2(x-3)平方+4的图像,并指出它们的开口方向,对称轴,和顶点坐标

Question

一道画图题,
在同一直角坐标系中画出函数y=-2x平方,y=-2(x-3)平方,y=-2(x+3)平方,y=-2(x-3)平方+4的图像,并指出它们的开口方向,对称轴,和顶点坐标

Answer 1

颜色一样

 
                                              开口方向,                             对称轴,                   和顶点坐标                       
y=-2x平方,                               下                                          x=0                                (0,0)
y=-2(x-3)平方,                         下                                          x=3                                (3,0)
y=-2(x+3)平方,                         下                                         x=-3                                (-3,0)
y=-2(x-3)平方+4                         下                                           x=3                               (-3,4)