What is the eccentricity of the ellipse 4x² + 9y² = 36?
Question 1
Q1. What is the eccentricity of the ellipse 4x² + 9y² = 36?
Answer: √5/3
Explanation: Divide by 36: x²/9 + y²/4 = 1. a²=9, b²=4 → c² = a² - b² = 5. e = c/a = √5/3.