If the co-ordinates of two points A and B are $\left( {\sqrt 7 ,0} \right)$ and $\left( { - \sqrt 7 ,0} \right)$ respectively and P is any point on the conic, 9x2 + 16y2 = 144, then PA + PB is equal to :

Question

If the co-ordinates of two points A and B
are $\left( {\sqrt 7 ,0} \right)$ and $\left( { - \sqrt 7 ,0} \right)$ respectively and
P is any point on the conic, 9x² + 16y² = 144, then PA + PB is equal to :

Solution

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