Design black box test suit for :-(software engineering question)

i)a function named quadratic-solver.The quadratic solver function accepts three floating point numbers (a,b,c) representing a quadratic equation of the form ax² + bx + c = 0.It computes and displays the solution.

ii)a function that accepts four pairs of floating point numbers representing 4 coodinate points.These 4 co-ordinate points represents the centers of two circles and a point on the circuference of each of the two circles.The function prints whether the 2 circles are intersecting ,one is contained within the other or are disjoint