First slide

Ellipse

Question

$For a point P on the ellipse 9 x^{2} + 36 y^{2} = 324, with foci S and S^{'}, value of SP + S^{'} P =$

Moderate

Solution

$\begin{array}{l} \frac{x^{2}}{36} + \frac{y^{2}}{9} = 1 \\ ∴ SP + S' P = 2 a = 12 \end{array}$

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