Home » Blog » Prove -(a/b) = (-a)/b = a/(-b) if b is not zero Prove -(a/b) = (-a)/b = a/(-b) if b is not zero by RoRi June 29, 2015 Prove that if . Proof. Since by Theorem I.9 (I.3.3, Exercise #1, part (c) we have . So, Similarly, Related