bonjour
x = x²
x - x² = 0
x ( 1 - x ) = 0
x = 0 ou 1
( x - 4 )² = - 8 x
x² - 8 x + 16 = - 8 x
x² - 8 x + 8 x + 16 = 0
x² + 16 = 0
x² = - 16 = pas de solution dans R
( x - 2)² = 16
( x - 2 )² - 16 = 0
( x - 2 - 4 ) ( x - 2 + 4 ) = 0
( x - 6 ) ( x + 2 ) = 0
x = 6 ou - 2
