Encore un peu d'aide SVP !! F = (x+1)(x+2)-5(x+2) H = 6x² -21 J = 49-16x²

F = (x+1)(x+2)-5(x+2)
   =(x+2)(x+1-5)
   =(x+2)(x-4)

H = 6x² -21
   =(V6x-V21)(V6x+V21)

J = 49-16x²
   =(7-4x)(7+4x)

F = (x + 1)(x+2) -5(x +2)      j'ai développé
F = (x² +2x +x +2) -5x -10
F = x² +3x +2 -5x -10
F = x² -2x -8
Factorisation
F( x + 1) (x+2) -5(x +2)
F = (x+2)( x+1 -5)
F = (x+2)(x -4)

H= 6x² -21
H= 3(2x² -7)

J = 49 -16x²
J= (7 -4x)(7 +4x)