1) [tex] \sqrt{15-x} + \sqrt3-{x} = 6[/tex]
2) [tex] \sqrt{5x-3} - \sqrt{2x-1} = \sqrt{3x-2} [/tex]
3) [tex] \sqrt[3]{ x^{3} -7 } =1[/tex]
4)[tex] \sqrt[4]{17 x^{2}-16} = x[/tex]