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Tohaina

\left(3+x-2y\right)\left(3+x+2y\right)
Tuhia anō te x^{2}+6x+9-4y^{2} hei \left(3+x\right)^{2}-\left(2y\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-2y+3\right)\left(x+2y+3\right)
Whakaraupapatia anō ngā kīanga tau.