bonjour
42 ² = ( 40 +2 )² = 1 600 + 160 + 4 = 1 764
103² = ( 100 + 3 )² = 10 000 + 600 + 9 = 10 609
24 ² = ( 20 + 4 )² = 400 + 160 + 16 = 576