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\left(3x-b\right)\left(3x+b\right)
Tuhia anō te 9x^{2}-b^{2} hei \left(3x\right)^{2}-b^{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).