Computation in a Permutation Group

Question

Let $\sigma , \tau \in S_3$ and $x \in X$. I need to show that for $\sigma=(1 \ 2) $ and $\tau=(2 \ 3)$, and $x = (1,2,3)$ that $(\sigma \circ \tau) \circ x \neq \sigma \circ (\tau \circ x)$. I understand how to do $(\sigma \circ \tau)$ but I don't understand how to compute the next step, or $(\tau \circ x)$.

Answer 1

It's false as permutation composition is associative