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\left(3z-2b-3\right)\left(3z-2b+3\right)
Tuhia anō te 9z^{2}-12zb+4b^{2}-9 hei \left(3z-2b\right)^{2}-3^{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).