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Tohaina

\left(5a\right)^{2}-\left(4b\right)^{2}
Ka taea te whakareanga te panoni ki te rerekētanga o ngā pūrua mā te ture: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
5^{2}a^{2}-\left(4b\right)^{2}
Whakarohaina te \left(5a\right)^{2}.
25a^{2}-\left(4b\right)^{2}
Tātaihia te 5 mā te pū o 2, kia riro ko 25.
25a^{2}-4^{2}b^{2}
Whakarohaina te \left(4b\right)^{2}.
25a^{2}-16b^{2}
Tātaihia te 4 mā te pū o 2, kia riro ko 16.
\left(5a\right)^{2}-\left(4b\right)^{2}
Ka taea te whakareanga te panoni ki te rerekētanga o ngā pūrua mā te ture: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
5^{2}a^{2}-\left(4b\right)^{2}
Whakarohaina te \left(5a\right)^{2}.
25a^{2}-\left(4b\right)^{2}
Tātaihia te 5 mā te pū o 2, kia riro ko 25.
25a^{2}-4^{2}b^{2}
Whakarohaina te \left(4b\right)^{2}.
25a^{2}-16b^{2}
Tātaihia te 4 mā te pū o 2, kia riro ko 16.