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Tohaina

\left(-2\right)^{2}\left(\sqrt{7}\right)^{2}
Whakarohaina te \left(-2\sqrt{7}\right)^{2}.
4\left(\sqrt{7}\right)^{2}
Tātaihia te -2 mā te pū o 2, kia riro ko 4.
4\times 7
Ko te pūrua o \sqrt{7} ko 7.
28
Whakareatia te 4 ki te 7, ka 28.