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\left(9p-8q\right)\left(9p+8q\right)
Tuhia anō te 81p^{2}-64q^{2} hei \left(9p\right)^{2}-\left(8q\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).