Răspuns:
a) B = {-3 ; -1 ; 1 ; 3}
b) B = {1 ; 4 ; 6}
c) A = N*
d) B = Z
Explicație pas cu pas:
a)
A = {-1 ; 0 ; 1 ; 2} f(x) = 1-2x
f(-1) = 1-2*(-1) = 1+2 = 3
f(0) = 1
f(1) = 1-2*1 = -1
f(2) = 1-2*2 = 1-4 = -3
B = {-3 ; -1 ; 1 ; 3}
b)
A = {-2 ; 1 ; 3) f(x) = 3 + x
f(-2) = 3 - 2 = 1
f(1) = 3 + 1 = 4
f(3) = 3 + 3 = 6
B = {1 ; 4 ; 6}
c)
A = N* f(x) = x ⇒ B = A = N*
d)
A = Z f(x) = x + 2
B = A = Z
