Fnd the equations of the tangent lines to the circle x2

Question

Question: (a) Find the equations of the tangent lines to the circle x² + y² = 25 at the points where x = 4.

(b) Find the equations of the normal lines to this circle at the same points. (The normal line is perpendicular to the tangent line at that point.)

(c) At what point do the two normal lines intersect?