(1)化成y=3(x+1/3)²-1/3
,x²的系数大于0,所以开口向上,对称轴为x=-1/3,顶点坐标为(-1/3,-1/3);
(2)化成y=-(x+1)²+1,
x²的系数小于0,所以开口向下,对称轴为x=-1,顶点坐标为(-1,1);
(3)化成y=-2(x-2)²,
x²的系数小于0,所以开口向下,对称轴为x=2,顶点坐标为(2,0);
(4)系数应该是1/2吧?
化成y=1/2(x-4)²-5,
x²的系数大于0,所以开口向上,对称轴为x=4,顶点坐标为(4,-5)
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