Bonjour,
h(x)= -3x-12
4.1 h(0)= -3(0)-12= -12
4.2 h(-2)= -3(-2)-12= 6-12= -6
4.3 -3x-12= 0
-3x= 12
x= -12/3
x= -4
4.4 -3x-12= 6
-3x= 6+12
x= -18/3
x= -6
