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\left(ab-15\right)\left(ab+15\right)
Tuhia anō te a^{2}b^{2}-225 hei \left(ab\right)^{2}-15^{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).