Whakaoti i te 2x^2+30=62

$$2 x ^ { 2 } + 30 = 62$$

Whakaoti mō x

$$x=4$$

$$x=-4$$

Ngā Hipanga Whakamahi Rerekētanga o ngā Pūrua

Tangohia te 62 mai i ngā taha e rua.

$$2x^{2}+30-62=0$$

Tangohia te 62 i te 30, ka -32.

$$2x^{2}-32=0$$

Whakawehea ngā taha e rua ki te 2.

$$x^{2}-16=0$$

Whakaarohia te x^{2}-16. Tuhia anō te x^{2}-16 hei x^{2}-4^{2}. Ka taea te rerekētanga o ngā pūrua te whakatauwehe mā te ture: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).

$$\left(x-4\right)\left(x+4\right)=0$$

Hei kimi otinga whārite, me whakaoti te x-4=0 me te x+4=0.

$$x=4 x=-4$$

Ngā Upane mā te Kimi Pūtakerua

Tangohia te 30 mai i ngā taha e rua.

$$2x^{2}=62-30$$

Tangohia te 30 i te 62, ka 32.

$$2x^{2}=32$$

Whakawehea ngā taha e rua ki te 2.

$$x^{2}=\frac{32}{2}$$

Whakawehea te 32 ki te 2, kia riro ko 16.

$$x^{2}=16$$

Tuhia te pūtakerua o ngā taha e rua o te whārite.

$$x=4 x=-4$$

Ngā Upane e Whakamahi ana i te Tikanga Tātai Pūrua

Tangohia te 62 mai i ngā taha e rua.

$$2x^{2}+30-62=0$$

Tangohia te 62 i te 30, ka -32.

$$2x^{2}-32=0$$

Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 2 mō a, 0 mō b, me -32 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{0±\sqrt{0^{2}-4\times 2\left(-32\right)}}{2\times 2}$$

Pūrua 0.

$$x=\frac{0±\sqrt{-4\times 2\left(-32\right)}}{2\times 2}$$

Whakareatia -4 ki te 2.

$$x=\frac{0±\sqrt{-8\left(-32\right)}}{2\times 2}$$

Whakareatia -8 ki te -32.

$$x=\frac{0±\sqrt{256}}{2\times 2}$$

Tuhia te pūtakerua o te 256.

$$x=\frac{0±16}{2\times 2}$$

Whakareatia 2 ki te 2.

$$x=\frac{0±16}{4}$$

Nā, me whakaoti te whārite x=\frac{0±16}{4} ina he tāpiri te ±. Whakawehe 16 ki te 4.

$$x=4$$

Nā, me whakaoti te whārite x=\frac{0±16}{4} ina he tango te ±. Whakawehe -16 ki te 4.

$$x=-4$$

Kua oti te whārite te whakatau.

$$x=4 x=-4$$