Factor
r\left(2s-1\right)^{2}
Evaluate
r\left(2s-1\right)^{2}
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r\left(4s^{2}-4s+1\right)
Factor out r.
\left(2s-1\right)^{2}
Consider 4s^{2}-4s+1. Use the perfect square formula, a^{2}-2ab+b^{2}=\left(a-b\right)^{2}, where a=2s and b=1.
r\left(2s-1\right)^{2}
Rewrite the complete factored expression.
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