Final answer:
The actual length of the line segment AB after scaling is 12 units.
Step-by-step explanation:
To find the actual length of the line segment AB after scaling, you can use the formula: actual length = scale factor * distance between the center and one of the endpoints. In this case, the distance between the center (3,2) and endpoint A (-1,2) is 4 units. Therefore, the actual length of AB would be 3 * 4 = 12 units.