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Given the ellipse with equation 9x^2 + 25y^2 = 225, find the eccentricity and foci.

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Given the ellipse with equation 9x2 + 25y2 = 225, find the eccentricity and foci.

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a = 5, b = 3

image b2 = a2 (1 - e2)

32 = 52 (1 - e2)

Hence, the eccentricity is 4/5 and foci is (±4,0).

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