How is the graph of y= -3 square root x-4 transformed to produce the graph of y= -3 square root 2x-4? the graph is stretched horizontally by a factor of 2 and then moved right 4 units. the graph is compressed horizontally by a factor of 2 and then moved down 4 units. the graph is compressed horizontally by a factor of 2, moved left 4 units, and moved down 4 units. the graph is stretched horizontally by a factor of 2, moved left 4 units, and moved down 4 units.