Répondre :
(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
(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