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Math·Advanced Math·Equivalent expressions

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$$f(x)=x^2-42x+80$$

The function $f$ is defined by the given equation. Which of the following equivalent forms of the equation displays the zeros of the function as constants or coefficients?

A

$f(x)=x^2-5x-37x+80$

B

$f(x)=(x-2)(x-40)$

C

$f(x)=x(x-42)+80$

D

$f(x)=(x-21{)}^2-361$