Réponse :
Explications étape par étape :
Bonjour
D(x) = (4 - 2x)² - ( 4 + 2x)²
D(x) = 16 + 2 × (4)(-2x) + (2x)² - (16 + 2 × (4)(2x) +(2x)²)
D(x) = 16 - 16 x + 4x² - (16 + 16 x+ 4x²)
D(x) = 16 - 16 x + 4x² - 16 - 16 x - 4x²
D(x) = - 32 x
E(x) = (x + 1)² - (x + 1)
E(x) = x² + 2× (x)(1) + 1² - (x + 1)
E(x) = x² + 2x + 1 - (x + 1)
E(x) = x² + 2x + 1 - x - 1
E(x) = x² + x
F(x) = 7 - x + 2 ( x - 2)(x - 1)
F(x) = 7 - x + 2 ( x² - x - 2x + 2)
F(x) = 7 - x + 2 ( x² - 3 x + 2)
F(x) = 7 - x + 2 x² - 6x + 4
F(x) = 2x² - 7x + 11
