1) [tex] \sqrt{2x+1} - \sqrt{x} = 1[/tex]
2) [tex] \sqrt{5-x} - \sqrt{5+x} =2[/tex]
3) [tex] \sqrt{x-2} + \sqrt{x+6} =4[/tex]
4)[tex] \sqrt{2x+5} - \sqrt{x+6} =1[/tex]