$$\left. \begin{array} { l } { 8 , 21 } \\ { 3 x - 2 x + 16 } \\ { 4 x + 3 x + 16 } \end{array} \right.$$
$168\left(x+16\right)\left(7x+16\right)$
$$8=2^{3}$$ $$21=3\times 7$$
$$168\left(x+16\right)\left(7x+16\right)$$
$$1176x^{2}+21504x+43008$$
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$8,\ 21,\ x+16,\ 7x+16$
