On hyperbola x2 − y216 = 1, the distance from a point P to one of its focal points is equal to 4, then the distance from point P to another focal point is equal to 4______ ．

On hyperbola x2 − y216 = 1, the distance from a point P to one of its focal points is equal to 4, then the distance from point P to another focal point is equal to 4______ ．

Let's set the left and right focus of hyperbola x2 − y2216 = 1 as F1, F2, and | a = 1, B = 4, respectively, F1, F2, right and left focus of hyperbola x2 − y2216 = 1, the distance from a point P on the hyperbolhyperbola x2 − y2216 = 1 to a focus is 4, the distance from a point P to a focus is 4, and the distance from a point P to a focus is 4, the distance from a point P to a focus is 4, the distance from a point P to a point P on a point P on the hyperbola hyperbola hyperbola x2 | Pf1 |-4-4||||||||-4 the distance from point P to another focus is equal to 6 (fill in "6 or 2" to give (3 points), others to give 0 points)