$$\left. \begin{array} { l } { ( z - 1 ) ( 1 - x ) } \\ { 12.2 } \\ { a ^ { 2 } + 8 a + 16 } \end{array} \right.$$
$\left(1-x\right)\left(z-1\right),\ 12.2,\ \left(a+4\right)^{2}$
