Répondre :
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)
=(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)
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)