# 1998 AHSME Problem 23

Geometry Level 3

The graphs of $$x^2 + y^2 = 4 + 12x + 6y$$ and $$x^2 + y^2 = k + 4x + 12y$$ intersect when k satisfies $$a \le k \le b$$, and for no other values of k. Find b-a.

×