Bonjour
B = (7x - 5) (3x - 2)
B = 21x² - 14x - 15x + 10
B = 21x² - 29x + 10
C = (2x + 1) (3x - 6) + 2x - 4
C = 6x² - 12x + 3x - 6 + 2x - 4
C = 6x² - 7x - 10
D = (2x - 3) (2x + 3)
D = 4x² - 9.
Réponse:
B=
[tex]21 {x}^{2} - 14x - 15x + 10[/tex]
[tex]21 {x}^{2} - 29x + 10[/tex]
C=
[tex]6 {x}^{2} - 12x + 3x - 6 + 2x - 4[/tex]
C
[tex] = 6 {x }^{2} - 7x - 10[/tex]
D=
[tex]4 {x}^{2} + 6x - 6 x - 9[/tex]
[tex]4 {x}^{2} - 9[/tex]
