[tex](3\sqrt{3})^2 = 9*3 = 27\\ (\sqrt{3})^3 = 3\sqrt{3}\\27 - 3\sqrt{3} = 21.81\\\\(3\sqrt{3})(3\sqrt{3}) - (3\sqrt{3}) = (3\sqrt{3})(3\sqrt{3} - 1)[/tex]
