# Eccentricity

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Please provide steps needed to find equation of and ellipse with given information. Please include formulas used and detailed step-by-step solution. Thank you:

1. Foci (+or- 5, 0), major semiaxis 13

2. Center (0,0), vertical major axis 12, minor axis 8

3. Foci (0,+or-4), eccentrity 2/3

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##### Solution Summary

Eccentricity is depicted. The expert examines ellipse formulas.

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Formula used:

If the foci are on the x-axis, the equation of an ellipse is

,where a>b, which means the major axis is the x-axis.

If the foci are on the y-axis, the equation of an ellipse is

,where a>b, which means the major axis is the y-axis.

1. ...

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