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\left(3b-7a\right)\left(3b+7a\right)
Tuhia anō te -49a^{2}+9b^{2} hei \left(3b\right)^{2}-\left(7a\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).
\left(-7a+3b\right)\left(7a+3b\right)
Whakaraupapatia anō ngā kīanga tau.