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a=\sqrt{90000-70^{2}}
Tātaihia te 300 mā te pū o 2, kia riro ko 90000.
a=\sqrt{90000-4900}
Tātaihia te 70 mā te pū o 2, kia riro ko 4900.
a=\sqrt{85100}
Tangohia te 4900 i te 90000, ka 85100.
a=10\sqrt{851}
Tauwehea te 85100=10^{2}\times 851. Tuhia anō te pūtake rua o te hua \sqrt{10^{2}\times 851} hei hua o ngā pūtake rua \sqrt{10^{2}}\sqrt{851}. Tuhia te pūtakerua o te 10^{2}.