bonjour
[tex]G = ( x+ 4 ) ( x + 1 ) \\ = x^{2} + x + 4 x + 4 \\ = x^{2} + 5 x + 4 \\\\H = ( x + 7 ) ( 4 x + 2 ) \\ = 4 x^{2} + 2 x + 28 x + 14 \\ = 4 x^{2} + 30 x + 14 \\\\I = ( 2 x + 1 ) ( 2 x - 1 ) = 4 x^{2} - 1 \\\\\\J = ( 2 x - 6 ) ( y + 3 ) \\ = 2 xy + 6 x - 6 y - 18 \\\\[/tex]
