Standard forms of equations of Ellipse

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Analytical Geometry
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What is the standard equation of an ellipse with center at the origin and major axis along the x-axis?
A
x²/a² + y²/b² = 1 (a > b)
B
y²/a² + x²/b² = 1 (a > b)
C
x²/b² + y²/a² = 1
D
x²/a² - y²/b² = 1
Analysis & Theory

If the major axis is along the x-axis, the equation is x²/a² + y²/b² = 1 with a > b.