[tex]a = {(3 - 2 \sqrt{2} )}^{2} = 9 - 12 \sqrt{2} + 8 = 17 - 12 \sqrt{2} [/tex]
[tex]b = {(3 + 2 \sqrt{2} )}^{2} = 9 + 12 \sqrt{2} + 8 = 17 + 12 \sqrt{2} [/tex]
[tex]m_{g} = \sqrt{ab} [/tex]
[tex]m_{g} = \sqrt{(17 - 12 \sqrt{2} )(17 + 12 \sqrt{2} )} [/tex]
[tex]m_{g} = \sqrt{ {17}^{2} - {(12 \sqrt{2}) }^{2} } [/tex]
[tex]m_{g} = \sqrt{289 - 288} [/tex]
[tex]m_{g} = \sqrt{1} [/tex]
[tex]m_{g} = 1[/tex]