Réponse :
Explications étape par étape
Bonjour,
Exercice 1
A= -18x
B= 40x²
C= 7x - yt
D= 18x +38
E= -7x² +60x
F= 5x² +17 -9x -3x² +8x -3 = 2x² -x +14
Exercice 2
A = 12x +21x²
B= -10 +15x
C= 15x +20 +8x² +20x = 8x² +35x +20
D= 12x -18 -35x² +15x = -35x² +27x -18
Exercice 3
A=5(9x -5)
B= 6x( 7x + 3)
C= (2x+5) ( 3x -2)
Exercice 4
x= 2
7*4 -4*2 -8 = 28 -8 -8 = 12
x= -3
7* 9 -4*-3 -8 = 63 +24 -8 = 79