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Math·Advanced Math·Nonlinear equations in one variable and systems of equations in two variables

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The polynomial $p^4+4p^3+3p^2-4p-4$ can be written as $(p^2-1)(p+2{)}^2$. What are all the roots of the polynomial?

A

$-2$ and $1$

B

$2$, $1$, and $4$

C

$-2$, $-1$, and $1$

D

$1$, $1$, and $2$