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Where are the foci of the ellipse x²/25 + y²/9 = 1?

A(±4, 0)
B(±5, 0)
C(0, ±4)
D(±3, 0)
Answer & Solution
Correct answer: A. (±4, 0)
Here a² = 25 and b² = 9, so c = sqrt(25 - 9) = 4 on the x-axis.
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