题目内容
设二次函数y=-x2+(m-2)x+3(m+1)的图象如图所示,则m的取值范围是( )
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A.m>-1 | B.m<2 | C.-1<m<2 | D.m<-1或m>2 |
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由图可知图象的对称轴x=
<0,得m<2,
又当x=0时,y=-x2+(m-2)x+3(m+1)=3(m+1)>0
得m>-1,
所以:-1<m<2.
故选C.
m-2 |
2 |
又当x=0时,y=-x2+(m-2)x+3(m+1)=3(m+1)>0
得m>-1,
所以:-1<m<2.
故选C.
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