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focus of an ellipse is at the origin. The directrix is the line x = 4 and the eccentricity is 1/2.

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+2 votes
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in Mathematics by (151k points)

focus of an ellipse is at the origin. The directrix is the line x = 4 and the eccentricity is 1/2.Then the length of the semi-major axis is

(a) 5/3

(b) 8/3

(c) 2/3

(d) 4/3.

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1 Answer

+1 vote
by (87.5k points)

(b) : Obviously the major axis is along the x-axis The distance between the focus and the

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