bonsoir
g (x) = ( 2 x - 1 )² - 4 x²
g ( 0) = ( - 1 )² = 1
g ( x) = 4 x² - 4 x + 1 - 4 x² = - 4 x +1
g ( -2) = 8 + 1 = 9
- 4 x + 1 = 11
- 4 x = 11 - 1
- 4 x = 10
x = - 10 /4 = - 5 /2
antécédent de 11 = - 5 /2
le 5 = tout est sur le tableau, c'est de la lecture
f (x) = - 2 x² - 3 x +1
f (0) = 1
f ( - 1 ) = - 2 ( - 1 )² - 3 ( -1) + 1 = - 2 + 3 + 1 = 2
g (x) = x ( x - 2 )
g ( 2) = 2 * 0 = 0
g ( - 1 ) = - 1 * - 3 = 3
x ( x - 2 )= 0
x = 0 ou 2
