Factoriser ses différentes expressions svp +(1à4)

F=9x²-48x+64=(3x-8)²
G=(3x-7)²-1=(3x-8)(3x-6)
H=F+G=(3x-8)(6x-14)
H=18x²-90x+112
x=1 donne H=40

Exercice 4 :

1/
F = 9x² - 48x + 64
F = (3x - 8)²

G = (3x - 7)² - 1
G = ((3x - 7) - 1) ( (3x - 7) + 1)
G = (3x - 8) (3x - 6)


2/
H = F+G
H = (3x - 8)² + (3x - 8) (3x - 6)
H = (3x - 8) ((3x - 8 + 3x - 6)
H =(3x - 8) (6x - 14)


3/
H =(3x - 8) (6x - 14)
H =18x - 48x - 42x +112
H = 18x² - 90x + 112


4/
pour x = 1
H = 18(1)² - 90(1) + 112
H = 18 - 90 + 112
H =  - 90 + 130
H =  40