Verified answer

Bonjour,

Développer et réduire les expressions:

A= (-4x-5)(4x-7)

A= -16x²-20x+28x+35

A= -16x²+8x+35

B= (8-8x)(-2x-5)

B= -16x+16x²-40+40x

B= 16x²+24x-40

C= 3(4x-7)(7x+5)

C= 3(28x²-79x+20x-35)

C= 3(28x²-29x-35)

C= 84x²-87x-105

D= 2x(-x-7)(10x+5)

D= 2x(-10x²-70x-5x-35)

D= 2x(-10x²-75x-35)

D= - 20x³-150x²-70x

Verified answer

Réponse :

Explications étape par étape

Bonjour

Developper et réduire :

A = (-4x - 5)(4x - 7)

A = -4x * 4x - 4x * (-7) - 5 * 4x - 5 * (-7)

A = -16x^2 + 28x - 20x + 35

A = -16x^2 + 8x + 35

B = (8 - 8x)(-2x - 5)

B = 8 * (-2x) + 8 * (-5) - 8x * (-2x) - 8x * (-5)

B = -16x - 40 + 16x^2 + 40x

B = 16x^2 + 24x - 40

C = 3(4x - 7)(7x + 5)

C = 3(28x^2 + 20x - 49x - 35)

C = 84x^2 - 3 * 29x - 105

C = 84x^2 - 87x - 105

D = 2x(-x - 7)(10x + 5)

D = 2x(-10x^2 - 5x - 70x - 35)

D = 2x(-10x^2 - 75x - 35)

D = -20x^3 - 150x^2 - 70x