Question

daca |2z-1|=3 si z∈ numerelor intregi(Z),atunci z∈{.............}

Answer 1

Bună! ⭐

__________

|2z-1| = 3

Caz 1

2z-1 = 3 /+1 ⇒ 2z = 4 /:2 ⇒ z = 2  ∈ Z

Caz 2

2z-1 = -3 /+1 ⇒ 2z = -2 /:2 ⇒ z = -1 ∈ Z

    z ∈ {-1; 2}