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Tohaina

9a^{2}-12a-4b^{2}+8b
Whakaarohia te 9a^{2}-4b^{2}-12a+8b hei pūrau ki runga i te taurangi a.
\left(3a-2b\right)\left(3a+2b-4\right)
Kimihia he tauwehe o te āhua ka^{m}+n, e wehea ai e ka^{m} te huatahi me te pū nui rawa 9a^{2}, e wehea hoki e n te tauwehe pūmau -4b^{2}+8b. Ko tētahi tauwehe pērā ko 3a-2b. Whakatauwehea te pūrau mā te whakawehe ki tēnei tauwehe.