bonsoir
2)x²=6
x = √6 ou - √6
3)7(x+4)−3(x+2)=3(x−1)−(x+7)
7 x + 28 - 3 x - 6 = 3 x - 3 - x - 7
4 x + 22 = 2 x - 10
4 x - 2 x = - 10 - 22
2 x = - 32
x = - 16
4)36x²−81=0
( 6 x - 9 ) ( 6 x + 9 ) = 0
x = 9/6 = 3/2 ou - 3 /2
5)(3x+1)²=16
( 3 x + 1 )² - 16 = 0
( 3 x + 1 - 4 ) ( 3 x + 1 + 4 ) = 0
( 3 x - 3 ) ( 3 x + 5 ) = 0
x = 1 ou - 5/3
