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