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\left(x-7t\right)\left(x+7t\right)
Tuhia anō te x^{2}-49t^{2} hei x^{2}-\left(7t\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).