Factor
5\left(9a-8c\right)^{2}
Evaluate
5\left(9a-8c\right)^{2}
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5\left(81a^{2}-144ac+64c^{2}\right)
Factor out 5.
\left(9a-8c\right)^{2}
Consider 81a^{2}-144ac+64c^{2}. Use the perfect square formula, p^{2}-2pq+q^{2}=\left(p-q\right)^{2}, where p=9a and q=8c.
5\left(9a-8c\right)^{2}
Rewrite the complete factored expression.
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