bonjour
f (x) = x² - x
f ( - 1) = 1 - ( - 1 ) = 1 + 1 = 2
f ( 0) = 0
f ( 2) = 4 - 2 = 2
g (x) = 2 x² - 5 x + 3
g ( - 3 ) = 2 *9 - 5 * - 3 + 3 = 18 + 15 + 3 = 36
h (x) = 3 x + 2
3 x + 2 = - 7
3 x = - 7 - 2
3 x = - 9
x = - 3
