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