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\left(3xy-2z\right)\left(3xy+2z\right)
Tuhia anō te 9x^{2}y^{2}-4z^{2} hei \left(3xy\right)^{2}-\left(2z\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).