$$1B { x }^{ 2 } +4-16x$$
$2\left(Bx-8\right)$
$$2Bx^{2-1}-16x^{1-1}$$
$$2Bx^{1}-16x^{1-1}$$
$$2Bx^{1}-16x^{0}$$
$$2Bx-16x^{0}$$
$$2Bx-16$$
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$Bx^{2}-16x+4$