Convex set

The coordinates of two points A and B in three-dimensional space are the following:

$$A = (7;10;-3), B=(-2;3;-9).$$

Write a product of the coordinates for the points of the line segment $AB$ in three-dimensional space. For example, if the coordinate formula of the line segment is (t+1, t-10, 15), the product is(t+1)*(t-10)*15.