Question

Se considera functia f. {-1,0,1,2 } -> R, f(x) = 2x -1
a) Calaculati f(-1) - f (0)
b) Calculati f(1) · f(2).
c)Determinati Multimea Valorii functiei (Im f).
d) Aflati Im f ∩ N

Answer 1

f(-1)=-2-1=-3
f(0)=0-1=-1
f(-1)-f(0)=-3-(-1)=-2




f(1)=2*1-1=1
f(2) =2*2-1=3
1*3=3


Im (f)={-3;-1;1;3}

Im (f)∩N={1;3}
as very simple as that!!!