Let P(x, y) be any point on the ellipse 25x^2+16y^2=400. If Q(0, 3) and R(0, -3) are two points, then what is (PQ+PR) equal to?

NDA 2020 Mathematics question

Let be any point on the ellipse . If and are two points, then what is equal to?

Answer: (B)

The ellipse is , with major axis along the y-axis: semi-major axis 5, and foci at $(0,

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Question ID VK-029224