D
ducnghia97


[TEX] \sqrt{x^2+12} +5 = 3x + \sqrt{x^2+5}[/TEX]
[TEX]\sqrt{x^2 +2x} + \sqrt{2x-1} = \sqrt{3x^2 +4x+1}[/TEX][/QUOTE]
[TEX]\sqrt{x^2 +2x} + \sqrt{2x-1} = \sqrt{3x^2 +4x+1}[/TEX][/QUOTE]