[tex]Bonjour\\\\\\\\A = 2 x + 10 + x^{2} - 1 \\A = x^{2} + 2 x + 9 \\\\B = x^{2} - 3 x + x^{2} - 4 \\B = 2 x^{2} - 3 x - 4 \\\\\\C = x^{2} - 16 + x^{2} + 2 x + 6 x + 12 \\C = 2 x^{2} + 8 x - 4 \\\\D = 16 x^{2} - 49 + 3 x^{2} + 2 x + 15 x + 10\\D = 19 x^{2} + 17 x - 39[/tex]