若一次函数y=ax+b(a≠0)的图象与x轴的交点坐标为(﹣2,0),则抛

若一次函数y=ax+ba≠0)的图象与x轴的交点坐标为(﹣20),则抛物线y=ax2+bx+c的对称轴为(  )

 

A

直线x=1

B

直线x=2

C

直线x=1

D

直线x=4

答案

C

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