Given that the Quasilinear of the ellipse is x = 4, the corresponding focal coordinate is (2,0), and the eccentricity is 1 / 2, then the equation of the ellipse is?

Alignment a & sup2 / C = 4
c=2
So a & sup2; = 8
Then E = C / a = √ 2 / 2, not equal to 1 / 2
Wrong title

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