$$\left. \begin{array} { l } { 5 + ( x + 1 ) ( x + 3 ) } \\ { 5 + ( x + 1 ) ( x + 3 ) } \end{array} \right.$$
$\left(x+1\right)\left(x+3\right)+5$
$$x^{2}+4x+8$$
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$\left(x+1\right)\left(x+3\right)+5,\ \left(x+1\right)\left(x+3\right)+5$
