bonsoir
g (x) = x ² - 2 x - 3
Δ = 4 - 4 ( - 3 ) = 4 + 12 = 16 = 4 ²
x 1 = ( 2 + 4 ) / 2 = 3
x 2 = ( 2 - 4 ) / 2 = - 1
( x - 3 ) ( x + 1 )
