摘要:5.抛物线y2=a(x+1)的准线方程是x=-3.则这条抛物线的焦点坐标是 C.
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已知圆的方程x2+y2=4,若抛物线过点A(0,-1),B(0,1)且以圆的切线为准线,则抛物线的焦点轨迹方程是( )
A.+=1(y≠0) | B.+=1(y≠0) |
C.+=1(x≠0) | D.+=1(x≠0) |
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已知圆的方程x2+y2=4,若抛物线过点A(0,-1),B(0,1)且以圆的切线为准线,则抛物线的焦点轨迹方程是( )
A.+=1(y≠0) | B.+=1(y≠0) |
C.+=1(x≠0) | D.+=1(x≠0) |