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Tohaina

a\left(b-2c\right)+c\left(b-2c\right)
Mahia te whakarōpūtanga ab-2ac+bc-2c^{2}=\left(ab-2ac\right)+\left(bc-2c^{2}\right), ka whakatauwehea atu a i te tuatahi me c i te rōpū tuarua.
\left(b-2c\right)\left(a+c\right)
Whakatauwehea atu te kīanga pātahi b-2c mā te whakamahi i te āhuatanga tātai tohatoha.