Use the square of a binomial formula to expand (2x+1)^2.
\( \begin{array}{l}\textbf{Simplify: } (2x + 1)^2\end{array} \)
Choose one option:
Always expand the square systematically: first square a, then 2ab, then b^2.
Apply (a+b)^2 = a^2 + 2ab + b^2 carefully for a = 2x and b = 1.
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