Whakaoti i te (2sqrt{7}-3)(2sqrt{7}+3)

$$( 2 \sqrt { 7 } - 3 ) ( 2 \sqrt { 7 } + 3 )$$

Aromātai

$$19$$

Ngā Upane Otinga

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}.

$$\left(2\sqrt{7}\right)^{2}-3^{2}$$

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

$$2^{2}\left(\sqrt{7}\right)^{2}-3^{2}$$

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

$$4\left(\sqrt{7}\right)^{2}-3^{2}$$

Ko te pūrua o \sqrt{7} ko 7.

$$4\times 7-3^{2}$$

Whakareatia te 4 ki te 7, ka 28.

$$28-3^{2}$$

Tātaihia te 3 mā te pū o 2, kia riro ko 9.

$$28-9$$

Tangohia te 9 i te 28, ka 19.

$$19$$

Tauwehe

$$19$$