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Tohaina

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