Sagot :
[tex]bonjour\\\\\\A = 2 x^{2} + 5 x - 3 x^{2} - 7 x - 8 \\ = - x^{2} - 2 x - 8 \\\\B = - 2 y + y^{2} - 7 y - 7 + 3 y^{2} - y \\ = 4y^{2} - 10 y - 7 \\\\C = 3 a + b - 4 - 6 a - 12 - 3 b + 4 b^{2} \\\\= 4 b^{2} - 2 b - 3 a - 16[/tex]
[tex]bonjour\\\\\\A = 2 x^{2} + 5 x - 3 x^{2} - 7 x - 8 \\ = - x^{2} - 2 x - 8 \\\\B = - 2 y + y^{2} - 7 y - 7 + 3 y^{2} - y \\ = 4y^{2} - 10 y - 7 \\\\C = 3 a + b - 4 - 6 a - 12 - 3 b + 4 b^{2} \\\\= 4 b^{2} - 2 b - 3 a - 16[/tex]