25/3
[tex](3\sqrt{11}-2\sqrt{5} ) *(3\sqrt{11}+2\sqrt{5} ) =(3\sqrt{11})^{2} -(2\sqrt{5})^{2} = (9*11)-(4*5) = 99-20=79[/tex]
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25/3
[tex](3\sqrt{11}-2\sqrt{5} ) *(3\sqrt{11}+2\sqrt{5} ) =(3\sqrt{11})^{2} -(2\sqrt{5})^{2} = (9*11)-(4*5) = 99-20=79[/tex]