bonsoir
A . 4 x + 7 = - 6 x - 4
4 x + 6 x = - 4 - 7
10 x = - 11
x = 11/10 = 1.1
B. 3 ( 5 x - 1 ) - ( x - 6 ) = 9
15 x - 3 - x + 6 = 9
14 x = 9 + 3 - 6
14 x = 6
x= 6/14 = 3 /7
C . 5 x /3 = 2 x / 15 - 1/5
25 x/15 = 2x /15 - 3 / 15
25 x - 2 x = - 3
23 x = - 3
x = - 3/23
D. x² = 59
x = √59 ou - √59
E . x² + 100 = 0
x² = - 100 ⇒ pas de solutions dans R
F . ( 3 - 8 x ) ( 8 x - 1 ) = 0
soit x = 3/8 soit x = 1/8
G . ( x - 4 )² = 64
( x - 4 )² - 64 = 0
( x - 4 - 8 ) ( x - 4 + 8 ) = 0
( x - 12 ) ( x + 4 ) = 0
x = 12 ou - 4
H . ( 1 + 4 x ) ( 1 + 4 x - 5 x + 2 ) = 0
( 1 + 4 x ) ( - x + 3 ) = 0
x = - 1/4 ou 3
