拋物線的頂點(diǎn)在原點(diǎn),對(duì)稱軸為x軸
∴拋物線方程可寫(xiě)作：y^2 = 2px
焦點(diǎn)坐標(biāo)為F（p/2,0）
拋物線上的點(diǎn)p（-5,m)到焦點(diǎn)F的距離為6
即：根號(hào){ [ p/2 - (-5) ]^2 + (0 - m)^2 ] = 6
p = -10 ± 2根號(hào)(36-m^2)
∴y = -4 [ 5+根號(hào)(36-m^2) ] x
或
y = -4 [ 5-根號(hào)(36-m^2) ] x