(2019·内蒙古中考模拟)已知函数的图象与x轴有交点.则的取值范

2019·内蒙古中考模拟)已知函数的图象与x轴有交点.则的取值范围是( )

Ak<4              Bk≤4             Ck<4k≠3       Dk≤4k≠3

答案

B

【解析】

若此函数与x轴有交点,则Δ≥0,即4-4(k-3)≥0,解得:k≤4,k=3时,此函数为一次函数,题目要求仍然成立,故本题选B.

考点:函数图像与x轴交点的特点.

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