问题:
已知抛物线y=-x 2+mx+n的顶点坐标是(-1,-3),则m和n的值分别是
A.2,4
B.-2,-4
C.2,-4
D.-2,0
已知抛物线y=-x 2+mx+n的顶点坐标是(-1,-3),则m和n的值分别是
A.2,4
B.-2,-4
C.2,-4
D.-2,0
A.2,4
B.-2,-4
C.2,-4
D.-2,0
参考答案: