bonjour
f (x) = 4 x + 2
f ( 0.5 ) = 4 *0.5 + 2 = 2 + 2 = 4
g (x) = 5 x - 3
5 x - 3 = 0
5 x = 3
x = 3/5
h (x) = 3 x² + 1
h ( 1) = 3 + 1 = 4
h (0) = 1
h ( 2) = 12 + 1 = 13 donc 4 est faux
h ( - 1 ) = h ( 1 )
h ( 1) = 4 et h ( - 1 ) = 4 donc vrai
h ( - 5 ) = 75 + 1 = 76
