Question

A={x apartine nr. nat.|13< sau egal decat x la puterea2< sau egaldecat 50}

Answer 1

13 ≤ x² ≤ 50 ⇒ x² ∈ {16,25,36,49}⇒ x∈{4,5,6,7}

A= { 4,5,6,7}