( 7 + 4 √ 3 ) * ( 2 - √ 3 )^2 = 1
1) ( 2 - √ 3)^2 = 4 - 4√3 + 3 = 7 - 4 √ 3
2) ( 7 + 4 √ 3 ) * ( 7 - 4 √ 3 ) = 49 - 16 * 3 = 49 - 48 = 1
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( √ 2 - 3)^2 * ( 11 + 6√2 ) = 49
1) ( √ 2 - 3)^2 = 2 - 6 √ 2 + 9 = 11 - 6 √ 2
2) ( 11 - 6 √ 2) * ( 11 + 6 √ 2) = 121 - 36 * 2 = 121 - 72 = 49