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\left(3r-10\right)\left(3r+10\right)
Tuhia anō te 9r^{2}-100 hei \left(3r\right)^{2}-10^{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).