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Tohaina

\left(9x\right)^{2}-\left(8z\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}.
9^{2}x^{2}-\left(8z\right)^{2}
Whakarohaina te \left(9x\right)^{2}.
81x^{2}-\left(8z\right)^{2}
Tātaihia te 9 mā te pū o 2, kia riro ko 81.
81x^{2}-8^{2}z^{2}
Whakarohaina te \left(8z\right)^{2}.
81x^{2}-64z^{2}
Tātaihia te 8 mā te pū o 2, kia riro ko 64.
\left(9x\right)^{2}-\left(8z\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}.
9^{2}x^{2}-\left(8z\right)^{2}
Whakarohaina te \left(9x\right)^{2}.
81x^{2}-\left(8z\right)^{2}
Tātaihia te 9 mā te pū o 2, kia riro ko 81.
81x^{2}-8^{2}z^{2}
Whakarohaina te \left(8z\right)^{2}.
81x^{2}-64z^{2}
Tātaihia te 8 mā te pū o 2, kia riro ko 64.