Scaling factor in the x-direction = (6 / 3) = 2
Scaling factor in the y-direction = (8 / 4) = 2
Scaling factor in the z-direction = (-2 / -1) = 2
The magnitude of the size change is given by the absolute value of the scaling factor, which in this case is |2| = 2.
Solution:
Therefore, the magnitude of the size change is 2