Réponse :
on a:
f(4)= (1.5 × 4) -3
= 6-3
=3
f(3)= (1.5× -3) -3
= -4.5-3
= -1.5
f([tex]\frac{4}{5}[/tex])= (1.5 ×[tex]\frac{4}{5}[/tex]) -3
= [tex]\frac{6}{5}[/tex]-3
= [tex]\frac{-9}{15}[/tex]
f(-[tex]\frac{8}{3}[/tex])= (1.5× [tex]\frac{-8}{3}[/tex])-3
=4-3
=1
b.
0=1.5x-3
3=1.5x
[tex]\frac{3}{1.5}[/tex]=x
x = 2
5=1.5x-3
5+3=1.5x
[tex]\frac{8}{1.5}[/tex]=x
-5=1.5x-3
-5+3=1.5x
-2=1.5x
[tex]\frac{-2}{1.5}[/tex] = x
