Réponse:
bonjour
4 x - 7 = 2 x + 13
4 x - 2 x = 13 + 7
2 x = 20
x = 10
( 5 x - 10 ) ( 3 x + 15 ) = 0
x = 10/5 = 2
ou bien x = - 15/3 = - 5
( 3 + x )² = 100
( 3 + x)² - 100 = 0
( 3 x + x - 10 ) ( 3 x + x + 10 ) = 0
( 4 x - 10 ) ( 4 x + 10 ) = 0
x = 10/4 ou bien - 10 /4
