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Tohaina

\left(9y-4x\right)\left(9y+4x\right)
Tuhia anō te -16x^{2}+81y^{2} hei \left(9y\right)^{2}-\left(4x\right)^{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(-4x+9y\right)\left(4x+9y\right)
Whakaraupapatia anō ngā kīanga tau.