对于抛物线,下列说法正确的是(    )A.开口向下,顶点坐标(5

对于抛物线,下列说法正确的是(    )

A.开口向下,顶点坐标(5,3)        B.开口向上,顶点坐标(5,3)

C.开口向下,顶点坐标(-5,3)   D.开口向上,顶点坐标(-5,3)

 

答案

B

解析:∵抛物线y=2(x-5)2+3,

∴抛物线的开口方向向上,

顶点坐标为(5,3).

故选B.

 

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