Answer:
zero product property
Explanation:
The Multiplication Property of Equality states that if you multiply both sides of an equation by the same number, the sides remain equal.
The Division Property of Equality states that if you divide both sides of an equation by the same nonzero number, the sides remain equal.
The Zero Product Property states that if
, then either
or
(or both).
The Transitive Property of Equality states if
and
, then

In the problem shown, to conclude that
or
you need to use zero product property.