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y^{2}-16
Tātaihia te 4 mā te pū o 2, kia riro ko 16.
\left(y-4\right)\left(y+4\right)
Ka taea te rerekētanga o ngā pūrua te whakatauwehe mā te ture: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).