Whakaoti i te x^2+9x-20

$$x ^ { 2 } + 9 x - 20$$

Tauwehe

$$\left(x-\frac{-\sqrt{161}-9}{2}\right)\left(x-\frac{\sqrt{161}-9}{2}\right)$$

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.

$$x^{2}+9x-20=0$$

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.

$$x=\frac{-9±\sqrt{9^{2}-4\left(-20\right)}}{2}$$

Pūrua 9.

$$x=\frac{-9±\sqrt{81-4\left(-20\right)}}{2}$$

Whakareatia -4 ki te -20.

$$x=\frac{-9±\sqrt{81+80}}{2}$$

Tāpiri 81 ki te 80.

$$x=\frac{-9±\sqrt{161}}{2}$$

Nā, me whakaoti te whārite x=\frac{-9±\sqrt{161}}{2} ina he tāpiri te ±. Tāpiri -9 ki te \sqrt{161}.

$$x=\frac{\sqrt{161}-9}{2}$$

Nā, me whakaoti te whārite x=\frac{-9±\sqrt{161}}{2} ina he tango te ±. Tango \sqrt{161} mai i -9.

$$x=\frac{-\sqrt{161}-9}{2}$$

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 \frac{-9+\sqrt{161}}{2} mō te x_{1} me te \frac{-9-\sqrt{161}}{2} mō te x_{2}.

$$x^{2}+9x-20=\left(x-\frac{\sqrt{161}-9}{2}\right)\left(x-\frac{-\sqrt{161}-9}{2}\right)$$

Aromātai

$$x^{2}+9x-20$$