Factor
16\left(r-2s\right)^{2}
Evaluate
16\left(r-2s\right)^{2}
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16\left(r^{2}-4rs+4s^{2}\right)
Factor out 16.
\left(r-2s\right)^{2}
Consider r^{2}-4rs+4s^{2}. Use the perfect square formula, a^{2}-2ab+b^{2}=\left(a-b\right)^{2}, where a=r and b=2s.
16\left(r-2s\right)^{2}
Rewrite the complete factored expression.
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