Bonjour,

a. 10 - 3x (4x + 1)

= 10 - 12x² - 3x

= - 12x² - 3x + 10

b. (x + 2) (x - 2) - (x + 3)

= x² - 4 - x - 3

= x² - x - 7

c. (1 + 4x) (x - 4x)

= 1 - 16x²

= - 16x² + 1

d. (- 5 * 3x) (x * 4)

= - 15x * 4x

= - 60x²

e. (2x + 2)²

= 4x² + 8x + 4

f. (2x - 3) (5x - 6) + 8

= 10x² - 12x - 15x + 18 + 8

= 10x² - 27x + 26.

Bonjour,

A=10-3x(4x+1)

A=10-12x^2-3x

A=-12x^2-3x+10

B=(x+2) (x-2)-(x+3)

B=x^2-4-x-3

B=x^2-x-7

C=(1+4x)(x-4x)

C=1-16x^2

C=-16x^2+1

D=(-5*3x)(x*4)

=-15x*4x

=-60x^2

E=(2x+2)^2

E=4x^2+8x+4

F=(2x-3)(5x-6)+8

F=10x^2-12x-15x+18+8

F=10x^2-27x+26

^2: au carré