Whakaoti i te {left(-2sqrt{7}right)}^2-4*4*1=

$${ \left(-2 \sqrt{ 7 } \right) }^{ 2 } -4 \times 4 \times 1=$$

Aromātai

$$12$$

Ngā Upane Otinga

Whakarohaina te \left(-2\sqrt{7}\right)^{2}.

$$\left(-2\right)^{2}\left(\sqrt{7}\right)^{2}-4\times 4\times 1$$

Tātaihia te -2 mā te pū o 2, kia riro ko 4.

$$4\left(\sqrt{7}\right)^{2}-4\times 4\times 1$$

Ko te pūrua o \sqrt{7} ko 7.

$$4\times 7-4\times 4\times 1$$

Whakareatia te 4 ki te 7, ka 28.

$$28-4\times 4\times 1$$

Whakareatia te 4 ki te 4, ka 16.

$$28-16\times 1$$

Whakareatia te 16 ki te 1, ka 16.

$$28-16$$

Tangohia te 16 i te 28, ka 12.

$$12$$

Tauwehe

$$2^{2}\times 3$$