Whakaoti i te 2x^2+7x

$$2 x ^ { 2 } + 7 x$$

Tauwehe

$$x\left(2x+7\right)$$

Ngā Upane Otinga

Tauwehea te x.

$$x\left(2x+7\right)$$

Ngā Upane e Whakamahi ana i te Tikanga Tātai Pūrua

Ka taea te huamaha pūrua te tauwehe mā te whakamahi i te huringa ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right), ina ko x_{1} me x_{2} ngā otinga o te whārite pūrua ax^{2}+bx+c=0.

$$2x^{2}+7x=0$$

Ko ngā whārite katoa o te āhua ax^{2}+bx+c=0 ka taea te whakaoti mā te whakamahi i te tikanga tātai pūrua: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. E rua ngā otinga ka puta i te tikanga tātai pūrua, ko tētahi ina he tāpiri a ±, ā, ko tētahi ina he tango.

$$x=\frac{-7±\sqrt{7^{2}}}{2\times 2}$$

Tuhia te pūtakerua o te 7^{2}.

$$x=\frac{-7±7}{2\times 2}$$

Whakareatia 2 ki te 2.

$$x=\frac{-7±7}{4}$$

Nā, me whakaoti te whārite x=\frac{-7±7}{4} ina he tāpiri te ±. Tāpiri -7 ki te 7.

$$x=\frac{0}{4}$$

Whakawehe 0 ki te 4.

$$x=0$$

Nā, me whakaoti te whārite x=\frac{-7±7}{4} ina he tango te ±. Tango 7 mai i -7.

$$x=-\frac{14}{4}$$

Whakahekea te hautanga \frac{-14}{4} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$x=-\frac{7}{2}$$

Tauwehea te kīanga taketake mā te whakamahi i te ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Me whakakapi te 0 mō te x_{1} me te -\frac{7}{2} mō te x_{2}.

$$2x^{2}+7x=2x\left(x-\left(-\frac{7}{2}\right)\right)$$

Whakamāmātia ngā kīanga katoa o te āhua p-\left(-q\right) ki te p+q.

$$2x^{2}+7x=2x\left(x+\frac{7}{2}\right)$$

Tāpiri \frac{7}{2} ki te x mā te kimi i te tauraro pātahi me te tāpiri i ngā taurunga. Ka whakaiti i te hautanga ki ngā kīanga tau iti rawa e taea ana.

$$2x^{2}+7x=2x\times \frac{2x+7}{2}$$

Whakakorea atu te tauwehe pūnoa nui rawa 2 i roto i te 2 me te 2.

$$2x^{2}+7x=x\left(2x+7\right)$$

Aromātai

$$x\left(2x+7\right)$$