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Ellipse x square / 25 + y square / 16 = 1 distance from a point P to the right focus 4. Then the distance to the left quasilinear of the ellipse
a²=25
b²=16
a=5,
c²=25-16=9
c=3
e=c/a=3/5
Defined by ellipse
Distance from P to left focus + distance from P to right focus = 2A = 10
So the distance from P to left focus = 6
The second definition of ellipse
Distance from P to left focus △ distance from P to left collimator = e = 3 / 5
So the distance from P to the left collimator is 10
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