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Tohaina

\left(3\sqrt{2}\right)^{2}-4^{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}.
3^{2}\left(\sqrt{2}\right)^{2}-4^{2}
Whakarohaina te \left(3\sqrt{2}\right)^{2}.
9\left(\sqrt{2}\right)^{2}-4^{2}
Tātaihia te 3 mā te pū o 2, kia riro ko 9.
9\times 2-4^{2}
Ko te pūrua o \sqrt{2} ko 2.
18-4^{2}
Whakareatia te 9 ki te 2, ka 18.
18-16
Tātaihia te 4 mā te pū o 2, kia riro ko 16.
2
Tangohia te 16 i te 18, ka 2.