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Tohaina

4a^{2}-4a-b^{2}+2b
Whakaarohia te 4a^{2}-b^{2}-4a+2b hei pūrau ki runga i te taurangi a.
\left(2a-b\right)\left(2a+b-2\right)
Kimihia he tauwehe o te āhua ka^{m}+n, e wehea ai e ka^{m} te huatahi me te pū nui rawa 4a^{2}, e wehea hoki e n te tauwehe pūmau -b^{2}+2b. Ko tētahi tauwehe pērā ko 2a-b. Whakatauwehea te pūrau mā te whakawehe ki tēnei tauwehe.