Sagot :
bonjour
f (x) = 2 x - 5
f ( -3) = - 6 - 5 = - 11
f ( 7) = 14 - 5 = 9
2 x - 5 = 7
2 x = 7 + 5
2 x = 12
x = 6
f ( 6) = 7
2 x - 5 = 4
2 x = 4 + 5
2 x = 9
x = 9/2
f ( 9/2 ) = 4
a.
f(-3)=-3-3-5= -11
b.
f(7)=7+7-5=9
c.
f(x)=7
x+x-5= 7
2x=12
x=6
d.
f(x)=4
x+x-5=4
2x=9
x=9/2