bonsoir
f (x) = ( x - 2 )² - 16
1. f (x) = x² - 4 x + 4 - 16 = x² - 4 x - 12
2. ( x - 2 - 4 ) ( x - 2 + 4 ) = ( x - 6 ) ( x + 2 )
f ( 2) = 2 ² - 4 *2 - 12 = 4 - 8 - 12 = - 16
3. ( x - 6 ) ( x + 2 ) = 0
x = 6 ou - 2
4 . x² - 4 x - 12 = - 12
x² - 4 x = 0
x ( x - 4 ) = 0
x = 0 ou 4
