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Tohaina

b\left(a-2\right)-\left(a-2\right)
Mahia te whakarōpūtanga ab-2b-a+2=\left(ab-2b\right)+\left(-a+2\right), ka whakatauwehea atu b i te tuatahi me -1 i te rōpū tuarua.
\left(a-2\right)\left(b-1\right)
Whakatauwehea atu te kīanga pātahi a-2 mā te whakamahi i te āhuatanga tātai tohatoha.