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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

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