If the distance from a point P to one focus on the hyperbola X225 − Y29 = 1 is 12, then the distance from it to the other focus is 12______ .

If the distance from a point P to one focus on the hyperbola X225 − Y29 = 1 is 12, then the distance from it to the other focus is 12______ .

Let the left and right focus of hyperbola be F1 and F2 respectively, then a = 5, B = 3 and C = 34. Let | Pf1 | = 12 (12 > a + C = 5 + 34), point P may be in the left or right branch. From | Pf1 | - | PF2 | = 2A = 10, we can get: | 12 - | PF2 | = 10, | PF2 | = 22 or 2