bonjour
f (x) = x ( 2 x - 5)
= 2 x² - 5 x
T ( 0.5 ) = 2 ( 0.5 )² - 5 * 0.5 = 0.5 - 2.5 = - 2 → T ∉ courbe
A ( 1/3 ) = 2 ( 1/3)² - 5 * 1/3 = 2 * 1/9 - 5/3 = 2/9 - 15/9 = - 13/9 → A ∉
B ( 3) = 2 *3² - 5 * 3 = 18 - 15 = 3 → B ∉
C ( - 2 ) = 2 ( - 2 )² - 5 * - 2 = 8 + 10 = 18 → C ∉
D ( - 3 ) = 2 ( - 3 )² - 5 * - 3 = 18 + 15 = 33 → D ∉
bon WE
