I set O as the origin of a a quadrilateral shape with vertices O, P ,Q, and R at (0,0), (6,0), (4,-8), and (-5,-20) respectively. The center of enlargement is simply the point from which we enlarge the image. The center of enlargement in this case is one of the vertices O. Each point will be enlarged from this, so we will double the x and y values for P Q and R to get the enlarged shape.
Therefore the enlarged shape has vertices O’ P’ Q’ R’ at (0,0) (15,0) (-10,-20) (-5,-20) respectively. I tried my best to draw this out and attached an image but I’m not a great artist!
Another way to do this would be to draw a ray through each vertices from the enlargement point O, and simply extend the line 1.5x its original length. If the length of the line is 6.. then the length of the new formed ray should be 2.5(6) = 15