The distance from a point P on the right branch of hyperbola x ^ 2 / 16-y ^ 2 / 9 = 1 to the left quasilinear is 18, then the distance from the point to the right focus is 18

The distance from a point P on the right branch of hyperbola x ^ 2 / 16-y ^ 2 / 9 = 1 to the left quasilinear is 18, then the distance from the point to the right focus is 18

a²=16
b²=9
c²=16+9=25
e=c/a=5/4
The second definition of hyperbola
Distance from P to the left focus △ distance from P to the left collimator = e = 5 / 4
therefore
Distance from P to left focus = 18 × 5 / 4 = 45 / 2
P in the right branch
It is defined by hyperbola
Distance from P to left focus - distance from P to right focus = 2A = 8
So the distance from P to the right focus is 29 / 2