$factor\left(x^4+x^3-6x^2-4x+8\right)$
$x^2-2x+1$
$factor\left(121+198x^6+81x^{12}\right)$
$x^2+6x+9$
$x^2+10x+25$
$x^2-6x+9$
$x^2+4x+4$
Factor the expression.
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