Question

设双曲线的中心在原点,坐标轴为对称轴,实轴与虚轴之和为14,焦距为10,求双曲线标准方程

Answer 1

由焦距可得到c=5,又c^2=a^2+b^2,实轴与虚轴为2a,2b,则有a^2+b^2=25,2a+2b=14,解方程组得a=3,b=4或a=4,b=3,则双曲线标准方程为x^2/9-y^2/16=1或x^2/16-y^2/9=1或y^2/9-x^2/16=1或y^2/16-x^2/9=1