notice the graph, the domain is just the horizontal area "used up" over the x-axis, so, the graph goees from [tex]\bf -\cfrac{5x}{2}\quad to\quad \cfrac{5x}{2}\implies domain\implies \left[-\cfrac{5x}{2}\ ,\ \cfrac{5x}{2}\right][/tex]
the range is just, the vertical area "used up" over the y-axis, so, the graph goes to 2 and down to -2, thus [tex]\bf range\implies [2\ ,\ -2][/tex]
