Whakaoti i te y^2-y-28

$$y ^ { 2 } - y - 28$$

Tauwehe

$$\left(y-\frac{1-\sqrt{113}}{2}\right)\left(y-\frac{\sqrt{113}+1}{2}\right)$$

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.

$$y^{2}-y-28=0$$

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.

$$y=\frac{-\left(-1\right)±\sqrt{1-4\left(-28\right)}}{2}$$

Whakareatia -4 ki te -28.

$$y=\frac{-\left(-1\right)±\sqrt{1+112}}{2}$$

Tāpiri 1 ki te 112.

$$y=\frac{-\left(-1\right)±\sqrt{113}}{2}$$

Ko te tauaro o -1 ko 1.

$$y=\frac{1±\sqrt{113}}{2}$$

Nā, me whakaoti te whārite y=\frac{1±\sqrt{113}}{2} ina he tāpiri te ±. Tāpiri 1 ki te \sqrt{113}.

$$y=\frac{\sqrt{113}+1}{2}$$

Nā, me whakaoti te whārite y=\frac{1±\sqrt{113}}{2} ina he tango te ±. Tango \sqrt{113} mai i 1.

$$y=\frac{1-\sqrt{113}}{2}$$

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{1+\sqrt{113}}{2} mō te x_{1} me te \frac{1-\sqrt{113}}{2} mō te x_{2}.

$$y^{2}-y-28=\left(y-\frac{\sqrt{113}+1}{2}\right)\left(y-\frac{1-\sqrt{113}}{2}\right)$$

Aromātai

$$y^{2}-y-28$$