- 5k²l - 20kl - 20l = - 5l(k² + 4k + 4) = - 5l * (k + 2)² = - 5l * (k + 2) * (k + 2)
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- 5k²l - 20kl - 20l = - 5l(k² + 4k + 4) = - 5l * (k + 2)² = - 5l * (k + 2) * (k + 2)