Precalculus (6th Edition)

$\left\{0, 2, 4\right\}$
$x \in Q$ and $x \in R$ means that the elements of the given set are in Q and are also in R. This is actually the definition of the intersection of the sets Q and R. Thus, the given set is equivalent to: $Q \cap R = \left\{0, 2, 4\right\}$