Whakaoti i te y^2+3y-21

$$y ^ { 2 } + 3 y - 21$$

Tauwehe

$$\left(y-\frac{-\sqrt{93}-3}{2}\right)\left(y-\frac{\sqrt{93}-3}{2}\right)$$

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.

$$y^{2}+3y-21=0$$

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.

$$y=\frac{-3±\sqrt{3^{2}-4\left(-21\right)}}{2}$$

Pūrua 3.

$$y=\frac{-3±\sqrt{9-4\left(-21\right)}}{2}$$

Whakareatia -4 ki te -21.

$$y=\frac{-3±\sqrt{9+84}}{2}$$

Tāpiri 9 ki te 84.

$$y=\frac{-3±\sqrt{93}}{2}$$

Nā, me whakaoti te whārite y=\frac{-3±\sqrt{93}}{2} ina he tāpiri te ±. Tāpiri -3 ki te \sqrt{93}.

$$y=\frac{\sqrt{93}-3}{2}$$

Nā, me whakaoti te whārite y=\frac{-3±\sqrt{93}}{2} ina he tango te ±. Tango \sqrt{93} mai i -3.

$$y=\frac{-\sqrt{93}-3}{2}$$

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{-3+\sqrt{93}}{2} mō te x_{1} me te \frac{-3-\sqrt{93}}{2} mō te x_{2}.

$$y^{2}+3y-21=\left(y-\frac{\sqrt{93}-3}{2}\right)\left(y-\frac{-\sqrt{93}-3}{2}\right)$$

Aromātai

$$y^{2}+3y-21$$