Besoin D'aide Svp, Niveau 3e

[tex]A(x) = (4x-2)(x-3)\\ A(x) = 4x^2-12x - 2x + 6\\ A(x) = 4x^2-14x+6\\\\ B(x) = (2x-1)(5-3x)\\ B(x) = 10x-6x^2-5+3x\\ B(x) = -6x^2+13x-5\\\\ C(x) = (3x+5)^2\\ C(x) = 9x^2 + 30x + 25\\\\ D(x) = (7-2x)^2\\ D(x) = 49 - 28x+4x^2\\ D(x) = 4x^2-48x+49[/tex]

4x X x +4x  X( -3) +(-2)X x +(-2) X(-3) = 4x²-12x-2x+6=4x²-14x+6

Si tu as besoin envoie moi un message A+