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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

\left(7-x-y\right)\left(7-x+y\right)
Tuhia anō te 49-y^{2}+x^{2}-14x hei \left(7-x\right)^{2}-y^{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).
\left(-x-y+7\right)\left(-x+y+7\right)
Whakaraupapatia anō ngā kīanga tau.