stp aider moi je comprends pas Exercice 3 : Développer et réduire les expressions suivantes. A(x) = (2x - 3)(5x - 4) B(x) = 2x(5x - 3) - 7 D(x) = (x + 5)2 *C(x)

Bonsoir,

Exercice 3 : Développer et réduire les expressions suivantes.

A(x) = (2x - 3)(5x - 4)

A(x) = 2x × 5x + 2x × (-4) - 3 × 5x - 3 × (-4)

A(x) = 10x² - 8x - 15x + 12

A(x) = 10x² - 23x + 12

B(x) = 2x(5x - 3) - 7

B(x) = 2x × 5x + 2x × (- 3) - 7

B(x) = 10x² - 6x - 7

D(x) = (x + 5)²

D(x) = (x + 5)(x + 5)

D(x) = x × x + x × 5 + 5 × x + 5 × 5

D(x) = x² + 5x + 5x + 25

D(x) = x² + 10x + 25

F(x) = (4x - 1)²

F(x) = (4x - 1) (4x - 1)

F(x) = 4x × 4x + 4x × (- 1) - 1 × 4x - 1 × (- 1)

F(x) = 16x² - 4x - 4x + 1

F(x) =  16x²- 8x + 1

E(x) = (6 + 7x)(6 - 7x)​

E(x) = 6 × 6 + 6 × (-7x) + 7x × 6 - 7x × (-7x)

E(x) = 36 - 42x + 42x + 49x²

E(x) = 49x² + 36