$$=x^{4}-x^{3}+4x^{2}+3x^{3}-3x^{2}+12x+1x^{2}-; 1x+4$$
$x\left(x^{3}+2x^{2}+2x+12\right)$
$$x^{4}+2x^{3}+4x^{2}-3x^{2}+12x+1x^{2}$$
$$x^{4}+2x^{3}+x^{2}+12x+1x^{2}$$
$$x^{4}+2x^{3}+2x^{2}+12x$$
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$$x\left(x^{3}-x^{2}+4x+3x^{2}-3x+12+x\right)$$
