Question

find the eccentricity of the ellipse whose equation is |z-4|+|z-12/5|=10​

Answer 1

Answer:

assuming that [12/5] is the greatest integer function, which will change the equation to

|z-4| + |z-2| = 10

Now Interpreting this as an ellipse is simple, basically the equation can be interpreted as the locus of a point in complex plane whose sum of distance from the points (4,0) and (2,0) is 10. This is the definition of an ellipse with focii as (4,0) and (2,0) and

2a = 10 thus a = 5 (semi-major axis). And distance between focii is 2ae = 2 adn hence

e = 1/a = 1/5

Hope this is helpful for you

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