Réponse :
A = - 7x - 7*4 + 2x*x + 2x*4
A = - 7x - 28 + 2x² + 8x
A = 2x² + x - 28
B = - 5*3 + 5*4x + 2x*3 - 2x*4x
B = - 15 + 20x + 6x - 8x²
B = - 8x² + 26x - 15
C = - 7,5a² - 14,5a² + 30a²
C = -22a² + 30a² = 8a²
a² = -8
a = racine de (-8)
D = 1/4 + t - 5/4t
D = 1/4 + 4/4t - 5/4t
D = 1/4 - 1/4t
-1/4t = - 1/4
t = 1
Explications étape par étape
