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若函数y=kx-3的图象如图所示,则方程x²+x+k-1=0根的存在情况是( )A.有两个不相等的实数根 B.有两个相等的实数根 C.没有实数根 D.无法确定
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6
8
10
12
二次函数y=x2﹣2x﹣3的图象如图所示下列说法中错误的是
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A.①② B.②③
③④
①④
若二次函数y=ax2+bx+ca<0的图象如图所示且关于x的方程ax2+bx+c=k有两个不相等的实
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②③
①④
②④
①③
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