Answer
$x^{4}-4x^{3}+6x^{2}-4x+1$
Work Step by Step
$(x^{2}-2x+1)^{2}=(x^{2}-2x+1)(x^{2}-2x+1)$
$=x^{2}(x^{2}-2x+1)-2x(x^{2}-2x+1)+1(x^{2}-2x+1)$
$=x^{4}-2x^{3}+x^{2}-2x^{3}+4x^{2}-2x+x^{2}-2x+1$
$=x^{4}-4x^{3}+6x^{2}-4x+1$
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