The distance from a point on the left support of hyperbola x square / 9-y square / 16 = 1 to the left focus is 7, then the distance from this point to the right focus of hyperbola is 7

||PF1|-|PF2||=2a=6
|PF1|=7
|PF2 | = 1 or 13
And | PF | > = C-A = 5-3 = 2
So | PF2 | = 13

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