(x-2)(x+6) = x (au carré) +4x-12 = (x+2) {au carré} -16 j'aimerais bien etre aide je bloques merci d'avance

(x-2)(x+6) = x *x +x *6 -2 *x -2 *6

=x² +6x -2x -12

=x² +4x -12

x ² +4x-12 = (x+2) ² -16

x² + 4x -12 = x² + 2*x *2 +2² -16

x² +4x -12 = x² +4x +4 -16

x² +4x -12 = x² +4x -12