What is meant by an ellipse in standard form?

Related questions

• What are common mistakes students make with ellipses in standard form?
• How do I write an ellipse in standard form?
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• How do I find the major and minor axes of an ellipse?
• How do I know whether the major axis of an ellipse is horizontal or vertical?
• How do I find the center of an ellipse with the equation #9x^2+16y^2-18x+64y=71#?
• How do I use completing the square to rewrite the equation of an ellipse in standard form?
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