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25x^{4}-729
Tātaihia te 3 mā te pū o 6, kia riro ko 729.
\left(5x^{2}-27\right)\left(5x^{2}+27\right)
Tuhia anō te 25x^{4}-729 hei \left(5x^{2}\right)^{2}-27^{2}. Ka taea te rerekētanga o ngā pūrua te whakatauwehe mā te ture: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right). Kāore i tauwehea ēnei pūrau i te mea kāhore ō rātou pūtake whakahau: 5x^{2}-27,5x^{2}+27.