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4a^{2}-20ba+21b^{2}
Whakaarohia te 4a^{2}-20ab+21b^{2} hei pūrau ki runga i te taurangi a.
\left(2a-7b\right)\left(2a-3b\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 21b^{2}. Ko tētahi tauwehe pērā ko 2a-7b. Whakatauwehea te pūrau mā te whakawehe ki tēnei tauwehe.