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Math·Advanced Math·Equivalent expressions

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$f(x)=x^2-4x-320$ The function $f$ is defined by the given equation. Which of the following equivalent forms of the equation displays the minimum value of the function as a constant or coefficient?

A

$f(x)=x^2-4(x+80)$

B

$f(x)=(x-2{)}^2+(-324)$

C

$f(x)=x(x-4)+(-320)$

D

$f(x)=(x+16)(x-20)$