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Tohaina

4\left(9a^{2}-1\right)
Tauwehea te 4.
\left(3a-1\right)\left(3a+1\right)
Whakaarohia te 9a^{2}-1. Tuhia anō te 9a^{2}-1 hei \left(3a\right)^{2}-1^{2}. Ka taea te rerekētanga o ngā pūrua te whakatauwehe mā te ture: p^{2}-q^{2}=\left(p-q\right)\left(p+q\right).
4\left(3a-1\right)\left(3a+1\right)
Me tuhi anō te kīanga whakatauwehe katoa.