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Tohaina

\left(9-5a\right)\left(9+5a\right)
Tuhia anō te 81-25a^{2} hei 9^{2}-\left(5a\right)^{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).
\left(-5a+9\right)\left(5a+9\right)
Whakaraupapatia anō ngā kīanga tau.