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\left(9x-1\right)\left(9x+1\right)
Tuhia anō te 81x^{2}-1 hei \left(9x\right)^{2}-1^{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).