aidez-moi svpppp, merci​

bonjour,

f (x) = 3 x

f ( 0.5) = 3 *0.5 =   1.5

g (x) = 2 x - 6

2 x - 6 = 0

2 x = 6

x = 3

g (3) = 0

h (x) = - 3 x² + 1

h ( 1) =  - 3 + 1  = - 2  

h ( 0) =  1

h ( - 3 x² + 1 ) = x

h ( 2 )  = - 3 ( 2) ² + 1 =  - 12 + 1 =  - 11 donc vrai

h ( -5) =  - 3 ( - 5 )² + 1 = - 3 *25 + 1 =  - 75 + 1 = - 74