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\left(2s-7\right)\left(2s+7\right)
Tuhia anō te 4s^{2}-49 hei \left(2s\right)^{2}-7^{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).