bonjour
105 ² = ( 100 + 5 )² = 10 000 + 1 000 + 25 = 11 025
49 ² = ( 50 - 1 )² = 2 500 - 100 + 1 = 2 401
38 x 42 = ( 40 - 2 ) ( 40 + 2 ) = 1 600 - 4 = 1 596
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bonjour
105 ² = ( 100 + 5 )² = 10 000 + 1 000 + 25 = 11 025
49 ² = ( 50 - 1 )² = 2 500 - 100 + 1 = 2 401
38 x 42 = ( 40 - 2 ) ( 40 + 2 ) = 1 600 - 4 = 1 596