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\left(3a-5\right)\left(3a+5\right)
Tuhia anō te 9a^{2}-25 hei \left(3a\right)^{2}-5^{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).