Réponse :
Bonsoir
F(x) = (x-1) (3x+2) = 3 x² + 2 x - 3 x - 2 = 3 x² - x - 2
F(x) = (3x+2) (-x+3) = - 3 x² + 9 x - 2 x + 6 = - 3 x² + 7 x + 6
F(x) = (-x+1) ( 2x-3) = - 2 x² + 3 x + 2 x - 3 = - 2 x² + 5 x - 3
F(x) = (2x+1) (x+2) = 2 x² + 4 x + x + 2 = 2 x² + 5 x + 2
Explications étape par étape
Bonsoir,
F(x) = (x-1) (3x+2) =
3x² +2x -3x -2 = 3x² -x -2
F(x) = (3x+2) (-x+3) =
-3x² +9x -2x +6 = -3x² +7x +6
F(x) = (-x+1) ( 2x-3) =
-2x² +3x +2x -3 = -2x² +5x -3
F(x) = (2x+1) (x+2) =
2x² +4x +x +2 = 2x² +5x +2