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Tohaina

2a^{2}+\left(-4b-5c\right)a+2b^{2}+2c^{2}+5bc
Whakaarohia te 2a^{2}+2b^{2}+2c^{2}-4ab-5ac+5bc hei pūrau ki runga i te taurangi a.
\left(2a-2b-c\right)\left(a-b-2c\right)
Kimihia he tauwehe o te āhua ka^{m}+n, e wehea ai e ka^{m} te huatahi me te pū nui rawa 2a^{2}, e wehea hoki e n te tauwehe pūmau 2b^{2}+5bc+2c^{2}. Ko tētahi tauwehe pērā ko 2a-2b-c. Whakatauwehea te pūrau mā te whakawehe ki tēnei tauwehe.