Răspuns :
[tex]f(x)=2x-1[/tex]
[tex]f(-1) = 2 \cdot (-1) - 1 = - 2 - 1 = - 3[/tex]
[tex]f(0) = 2 \cdot 0 - 1 = 0 - 1 = -1[/tex]
[tex]f(1) = 2 \cdot 1 - 1 = 2 - 1 = 1[/tex]
⇒
[tex]f(-1)+f(0)-f(1) = -3 + (-1) - 1 = -3 - 1 - 1 = - 5 < - 4\\[/tex]
q.e.d.
Răspuns:
f(-1)=2*(-1)-1=-3
f(0)=2*0-1=-1
f(1)=2*1-1=1
f(-1)+f(0)-f(1)=-3-1-1=-5<-4