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The ellipse with foci (±3, 0) and semi-major axis 5 has equation
Ax²/25 + y²/16 = 1
Bx²/25 + y²/9 = 1
Cx²/5 + y²/3 = 1
Dx²/16 + y²/25 = 1
Answer & Solution
Correct answer: A. x²/25 + y²/16 = 1
b² = a² - c² = 25 - 9 = 16, and the foci on the x-axis put a² under x².
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