Réponse :
Explications étape par étape
Bjr,
A=(x-4)² - 9 =0
(x-4)² =9
x-4 = 3 (3² = 9)
x= 7
B=(x-4)² +6(x-4) =0
on factorise.
(x-4) (x-4 +6)= (x-4) ( x+2) = 0
x=4
ou
x = -2
C=(2x-3)²= 5(2x - 3)
(2x-3)²- 5(2x - 3) =0
(2x-3) (2x-3 -1) = (2x-3) ( 2x-4) =0
(2x-3) ( 2x-4) =0
2x-3 =0
2x=3
x=3/2
ou
2x-4 = 0
x=4/2 = 2
D=(x+2)²=9
x+2 = 3
x = 3/2
☺