a) [tex]\sqrt{27} = \sqrt{9 * 3} = \sqrt{9} * \sqrt{3}= 3 * \sqrt{3} = 3\sqrt{3}[/tex]
b) [tex]\sqrt{128} = \sqrt{64 * 2} = \sqrt{64} * \sqrt{2} = 8 * \sqrt{2} = 8\sqrt{2}[/tex]
:)
