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\left(6a-7\right)\left(6a+7\right)
Tuhia anō te 36a^{2}-49 hei \left(6a\right)^{2}-7^{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).