bonjour,
f (x) = ( x + 1 ) ( x - 2 )
f ( 1 ) = ( 1 + 1 ) ( 1 - 2) = 2*-1 = - 2
f ( 0) = 1 * - 2 = - 2
donc correspond graphique C
g (x) = - 2.5 x²
g ( 0) = 0
donc graph A
h (x) = 2 x² - 1
h ( 0) = - 1
donc graph B
i (x) = - 2 ( x + 0.5) ( x - 1.5)
i ( 0) = - 2 ( 0 + 0.5) ( 0 - 1.5)
i (0) = - 2 ( 0.5 * - 1.5) = - 2 * - 0.75 = 1.5 donc graph D
