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Tohaina

\left(7+k^{3}\right)\left(7-k^{3}\right)
Tuhia anō te 49-k^{6} hei 7^{2}-\left(-k^{3}\right)^{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).
\left(k^{3}+7\right)\left(-k^{3}+7\right)
Whakaraupapatia anō ngā kīanga tau. Kāore i tauwehea ēnei pūrau i te mea kāhore ō rātou pūtake whakahau: -k^{3}+7,k^{3}+7.