Réponse :
bonjour
f(x) = (x + 2)(2x - 3)-3(x + 1)
f (x) = 2 x² - 3 x + 4 x - 6 - 3 x- 3
f (x) = 2 x² - 2 x - 9
g(x) = -x(x + 4) + (x - 3)(1 - 2x)
g (x) = - x² - 4 x + x - 2 x² - 3 + 6 x
g (x) = - 3 x² + 3 x - 3
h(x) =(28x - 49) + 0,2x(5 - 10x)
h (x) = 28 x - 49 + x - 2 x²
h (x) = - 2 x² + 29 x - 49
k(x) = (3x - 2(1 - x)] x [5x - 2 + 4(3 - x)]
k (x) = ( 3 x - 2 + x ) ( 5 x - 2 + 12 - 4 x )
k (x) = ( 4 x - 2 ) ( x + 10 )
k (x) = 4 x² + 40 x - 2 x - 20
k ( x) = 4 x² + 38 x - 20
Explications étape par étape :
