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Tohaina

7\left(9-y^{2}\right)
Tauwehea te 7.
\left(3-y\right)\left(3+y\right)
Whakaarohia te 9-y^{2}. Tuhia anō te 9-y^{2} hei 3^{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(-y+3\right)\left(y+3\right)
Whakaraupapatia anō ngā kīanga tau.
7\left(-y+3\right)\left(y+3\right)
Me tuhi anō te kīanga whakatauwehe katoa.