4. (a) (4 points) Find equations of both lines through the point (2, 3) that are tangent to the parabola y = 3:2 + 3:. (b) (5 points) Find the equation of the tangent line to the curve 3; = 3:2 at a: = 1. Show that this line is also tangent to a circle centered at (8, 0) and nd the equation of this circle