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JEE Main 2026 Mathematics question

MathematicsEllipseJEE Main 2026

Let represent an ellipse with major axis along y-axis, where f is a strictly decreasing positive function on ℝ. If the set of all possible values of a is ℝ − [α, β], then α² + β² is equal to:

Answer: (B)

Solution

Major axis along the y-axis requires f(3a+15)>f(a²+7a+3). Since f is strictly decreasing,

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Question ID VK-015729