Sagot :

Réponse:

[tex]b = - 4(6 - 5x) \\ b = - 4 \times 6 - ( - 4) \times 5x \\ b = - 24 - ( - 20) \\ b = - 4[/tex]

[tex]c = (4x + 3) \times 2x\\ c = 2x \times 4x + 2x \times 3 \\ c = {8x}^{2} + 6x [/tex]

[tex]d = 12 - (5 - 2 x) \\ d = 12 \times 5 - 12 \times 2x \\ d = 60 - 24x[/tex]
A= 3(5x+2)
A= 3 x 5x + 3 x 2
A= 15x + 6

B= -4(6-5x)
B= -4 x 6 -4 x (-5x)
B= -24 + 20x
B= 20x + 24

C = (4x+3) x 2x
C= 2x x 4x + 2x x 3
C = 8x^2 + 6x

D = 12 - (5-2x)
D= -2x + 12 - 5
D = -2x + 7