bonsoir
25 x² = 4
x² = 4/25
x = √4/25 ou - √4/25
x = 2/5 ou - 2 /5
9 x² - 64 = 0
( 3 x - 8 ) ( 3 x + 8) = 0
x = 8/3 ou - 8/3
49 x² - 100 = 0
( 7 x - 10 ) ( 7 x + 10 ) = 0
x = 10/7 ou - 10/7
