Question

Salut, ajutati-ma va rog. Dau coroana!

Answer 1

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