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

If the co-ordinates of two points A and B are (√7,0) and (−√7,0)

1.	If the co-ordinates of two points A and B are (√7,0) and (−√7,0) respectively and P is any point on the conic, 9x2+16y2=144, then PA+PB is equal to :
Answer» If the co-ordinates of two points $A$ and $B$ are $(\sqrt{7}, 0)$ and $(- \sqrt{7}, 0)$ respectively and $P$ is any point on the conic, $9 x^{2} + 16 y^{2} = 144$ , then $P A + P B$ is equal to :