求与双曲线x^2/16-y^2/9=1共渐近线且过A(2根号3,-3)点的双曲线方程及离心率
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原双曲线渐近线方程为:y=±3x/4,
设所求双曲线方程为:x^2/(4m)^2-y^2/(3m)^2=1,,
将(2√3,-3)代入方程,3/4m^2-1/m^2=1,
m^2=-1/4,无实数解,故应选择实轴为y轴,
设双曲线方程为:y^2/(3m)^2-x^2/(4m)^2=1,
将(2√3,-3)代入方程,
9/(9m^2)-12/(16m^2)=1
m=1/2, a=4*1/2=2,b=3*1/2=3/2,所求双曲线方程为:4y^2/9-x^2/4=1,
c=√(a^2+b^2)=5/2,
离心率e= c/b=(5/2)/(3/2)=5/3.
设所求双曲线方程为:x^2/(4m)^2-y^2/(3m)^2=1,,
将(2√3,-3)代入方程,3/4m^2-1/m^2=1,
m^2=-1/4,无实数解,故应选择实轴为y轴,
设双曲线方程为:y^2/(3m)^2-x^2/(4m)^2=1,
将(2√3,-3)代入方程,
9/(9m^2)-12/(16m^2)=1
m=1/2, a=4*1/2=2,b=3*1/2=3/2,所求双曲线方程为:4y^2/9-x^2/4=1,
c=√(a^2+b^2)=5/2,
离心率e= c/b=(5/2)/(3/2)=5/3.
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