Line segment BA is tangent to the circle. A circle is shown. Secant D B and tangent B A intersect at point B outside of the circle. Secant D B intersects the circle at point C. The length of A B is x, the length of BC is 55, and the length of C D is 120. What is the length of the line segment BA? Round to the nearest unit.
18 units
65 units
88 units
98 units