Answer
$4x^2-4x+1$
Work Step by Step
Using $(a+b)^2=a^2+2ab+b^2$ or the square of a binomial, the given expression, $
(2x-1)^2
$, is equivalent to
\begin{array}{l}\require{cancel}
(2x)^2+2(2x)(-1)+(-1)^2
\\\\=
4x^2-4x+1
.\end{array}
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