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Tohaina

\left(-2+x-3y\right)\left(-2+x+3y\right)
Tuhia anō te x^{2}-9y^{2}-4x+4 hei \left(-2+x\right)^{2}-\left(3y\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(x-3y-2\right)\left(x+3y-2\right)
Whakaraupapatia anō ngā kīanga tau.