Réponse :
bonjour
A = 9 x + 9 y = 9 ( x + y)
B = kz- zp = z ( k - p )
c = 7 s + 9 w , pas de factorisation possible
D = 10 x - 5 y = 5 ( 2 x - y)
E = x + 3 x² = x ( 1 + 3 x )
F = 8 ab - 4 bc = 4 b ( 2 a - c )
G = ( x + 2 ) ( x + 1 + 2 x + 3 ) = ( x + 2 ) ( 3 x + 4 )
H = 81 x² - 25 = ( 9 x - 5 ) ( 9 x + 5 )
( 3 x + 5 ) ( 4 x - 7 ) = 0
x = - 5/3 ou 7/4
x² = 25
x = √25 ou - √25
x = 5 ou - 5
x
2 x
2 x - 1
( 2 x - 1 )² = 4 x² - 4 x + 1
4 x² - 4 x + 1 - 1
= 4 x² - 4 x
on choisit 4
on obtient 4 * 4² - 4 *4 = 64 - 16 = 48
on choisit - 2 on obtient 4 ( -2)² - 4 *- 2 = 16 + 8 = 24
Explications étape par étape
