Whakaoti i te x^2+5x-21

$${ x }^{ 2 } +5x-21$$

Tauwehe

$$\left(x-\frac{-\sqrt{109}-5}{2}\right)\left(x-\frac{\sqrt{109}-5}{2}\right)$$

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.

$$x^{2}+5x-21=0$$

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.

$$x=\frac{-5±\sqrt{5^{2}-4\left(-21\right)}}{2}$$

Pūrua 5.

$$x=\frac{-5±\sqrt{25-4\left(-21\right)}}{2}$$

Whakareatia -4 ki te -21.

$$x=\frac{-5±\sqrt{25+84}}{2}$$

Tāpiri 25 ki te 84.

$$x=\frac{-5±\sqrt{109}}{2}$$

Nā, me whakaoti te whārite x=\frac{-5±\sqrt{109}}{2} ina he tāpiri te ±. Tāpiri -5 ki te \sqrt{109}.

$$x=\frac{\sqrt{109}-5}{2}$$

Nā, me whakaoti te whārite x=\frac{-5±\sqrt{109}}{2} ina he tango te ±. Tango \sqrt{109} mai i -5.

$$x=\frac{-\sqrt{109}-5}{2}$$

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{-5+\sqrt{109}}{2} mō te x_{1} me te \frac{-5-\sqrt{109}}{2} mō te x_{2}.

$$x^{2}+5x-21=\left(x-\frac{\sqrt{109}-5}{2}\right)\left(x-\frac{-\sqrt{109}-5}{2}\right)$$

Aromātai

$$x^{2}+5x-21$$