Réponse :

Bonjour!

Explications étape par étape :

A(x) = -(5x-2)

A(x) = -1 × (5x-2)

A(x) = -1 × 5x  -1 × (-2)

A(x) = -5x + 2

B(x) = (2-5x) × 3

B(x) = 2 × 3  -5 × x × 3

B(x) = 6  - 1 × 5 × 3 × x

B(x) = 6  - 15 × x

B(x) = -15x + 6

C(x) = -7x + 3 + 8x - 1

C(x) =  -7x + 8x + 3 - 1

C(x) = (-7+8) × x  + 2

C(x) = (8-7) × x +2

C(x) = 1x + 2

C(x) = x + 2

D(x) = 3(x+5) - 2

D(x) = 3 × (x+5) - 2

D(x) = 3 × x  +  3 × 5  - 2

D(x) = 3x + 15 -2

D(x) = 3x + 13

E(x) = 7(4 - x)                - (-x + 1)

E(x) = 7 × (4 - x)           - 1 × (-x + 1)

E(x) = 7 × 4 + 7 × (-x)   -1 × (-x)  -1 × 1

E(x) =   28      -7x          + 1x        -1

E(x) = -6x +27