Whakaoti i te -7x^2-6+9x+8x^2-12x

$$- 7 x ^ { 2 } - 6 + 9 x + 8 x ^ { 2 } - 12 x$$

Aromātai

$$x^{2}-3x-6$$

Ngā Upane Otinga

Pahekotia te -7x^{2} me 8x^{2}, ka x^{2}.

$$x^{2}-6+9x-12x$$

Pahekotia te 9x me -12x, ka -3x.

$$x^{2}-6-3x$$

Tauwehe

$$\left(x-\frac{3-\sqrt{33}}{2}\right)\left(x-\frac{\sqrt{33}+3}{2}\right)$$

Ngā Upane e Whakamahi ana i te Tikanga Tātai Pūrua

Pahekotia te -7x^{2} me 8x^{2}, ka x^{2}.

$$factor(x^{2}-6+9x-12x)$$

Pahekotia te 9x me -12x, ka -3x.

$$factor(x^{2}-6-3x)$$

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.

$$x^{2}-3x-6=0$$

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.

$$x=\frac{-\left(-3\right)±\sqrt{\left(-3\right)^{2}-4\left(-6\right)}}{2}$$

Pūrua -3.

$$x=\frac{-\left(-3\right)±\sqrt{9-4\left(-6\right)}}{2}$$

Whakareatia -4 ki te -6.

$$x=\frac{-\left(-3\right)±\sqrt{9+24}}{2}$$

Tāpiri 9 ki te 24.

$$x=\frac{-\left(-3\right)±\sqrt{33}}{2}$$

Ko te tauaro o -3 ko 3.

$$x=\frac{3±\sqrt{33}}{2}$$

Nā, me whakaoti te whārite x=\frac{3±\sqrt{33}}{2} ina he tāpiri te ±. Tāpiri 3 ki te \sqrt{33}.

$$x=\frac{\sqrt{33}+3}{2}$$

Nā, me whakaoti te whārite x=\frac{3±\sqrt{33}}{2} ina he tango te ±. Tango \sqrt{33} mai i 3.

$$x=\frac{3-\sqrt{33}}{2}$$

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{33}}{2} mō te x_{1} me te \frac{3-\sqrt{33}}{2} mō te x_{2}.

$$x^{2}-3x-6=\left(x-\frac{\sqrt{33}+3}{2}\right)\left(x-\frac{3-\sqrt{33}}{2}\right)$$