Réponse :
factoriser ces expressions
E(x) = (2x-1)-(6x-3)(x+2)
= (2x-1)- 3(2x-1)(x+2)
= (2 x - 1)(1 - 3 x - 6)
= (2 x - 1)(- 3 x - 5)
F(x) = (x+1)²-4(x-1)²
= (x+1)²- (2(x-1))² IDR a²-b²=(a+b)(a-b)
= (x + 1 + 2 x - 2)(x + 1 - 2 x + 2)
= (3 x - 1)(3 - x)
G(x) = 9x²+6x+1+(x-4)(3x+1) IDR a² + 2ab+b² = (a+b)²
= (3 x + 1)² + (x - 4)(3 x + 1)
= (3 x + 1)(3 x + 1 + x - 4)
= (3 x + 1)(4 x - 3)
Explications étape par étape :