Whakaoti i te 2x^2-3x+6=0

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

Whakaoti mō x (complex solution)

$$x=\frac{3+\sqrt{39}i}{4}\approx 0.75+1.5612495i$$

$$x=\frac{-\sqrt{39}i+3}{4}\approx 0.75-1.5612495i$$

Ngā Upane e Whakamahi ana i te Tikanga Tātai Pūrua

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.

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

Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 2 mō a, -3 mō b, me 6 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

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

Pūrua -3.

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

Whakareatia -4 ki te 2.

$$x=\frac{-\left(-3\right)±\sqrt{9-8\times 6}}{2\times 2}$$

Whakareatia -8 ki te 6.

$$x=\frac{-\left(-3\right)±\sqrt{9-48}}{2\times 2}$$

Tāpiri 9 ki te -48.

$$x=\frac{-\left(-3\right)±\sqrt{-39}}{2\times 2}$$

Tuhia te pūtakerua o te -39.

$$x=\frac{-\left(-3\right)±\sqrt{39}i}{2\times 2}$$

Ko te tauaro o -3 ko 3.

$$x=\frac{3±\sqrt{39}i}{2\times 2}$$

Whakareatia 2 ki te 2.

$$x=\frac{3±\sqrt{39}i}{4}$$

Nā, me whakaoti te whārite x=\frac{3±\sqrt{39}i}{4} ina he tāpiri te ±. Tāpiri 3 ki te i\sqrt{39}.

$$x=\frac{3+\sqrt{39}i}{4}$$

Nā, me whakaoti te whārite x=\frac{3±\sqrt{39}i}{4} ina he tango te ±. Tango i\sqrt{39} mai i 3.

$$x=\frac{-\sqrt{39}i+3}{4}$$

Kua oti te whārite te whakatau.

$$x=\frac{3+\sqrt{39}i}{4} x=\frac{-\sqrt{39}i+3}{4}$$

Ngā Upane mō te Whakaoti i te Pūrua

Ko ngā whārite pūrua pēnei i tēnei nā ka taea te whakaoti mā te whakaoti i te pūrua. Hei whakaoti i te pūrua, ko te whārite me mātua tuhi ki te āhua x^{2}+bx=c.

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

Me tango 6 mai i ngā taha e rua o te whārite.

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

Mā te tango i te 6 i a ia ake anō ka toe ko te 0.

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

Whakawehea ngā taha e rua ki te 2.

$$\frac{2x^{2}-3x}{2}=-\frac{6}{2}$$

Mā te whakawehe ki te 2 ka wetekia te whakareanga ki te 2.

$$x^{2}-\frac{3}{2}x=-\frac{6}{2}$$

Whakawehe -6 ki te 2.

$$x^{2}-\frac{3}{2}x=-3$$

Whakawehea te -\frac{3}{2}, te tau whakarea o te kīanga tau x, ki te 2 kia riro ai te -\frac{3}{4}. Nā, tāpiria te pūrua o te -\frac{3}{4} ki ngā taha e rua o te whārite. Mā konei e pūrua tika tonu ai te taha mauī o te whārite.

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

Pūruatia -\frac{3}{4} mā te pūrua i te taurunga me te tauraro o te hautanga.

$$x^{2}-\frac{3}{2}x+\frac{9}{16}=-3+\frac{9}{16}$$

Tāpiri -3 ki te \frac{9}{16}.

$$x^{2}-\frac{3}{2}x+\frac{9}{16}=-\frac{39}{16}$$

Tauwehea x^{2}-\frac{3}{2}x+\frac{9}{16}. Ko te tikanga pūnoa, ina ko x^{2}+bx+c he pūrua tika pūrua tika pū, ka taea taua mea te tauwehea i ngā wā katoa hei \left(x+\frac{b}{2}\right)^{2}.

$$\left(x-\frac{3}{4}\right)^{2}=-\frac{39}{16}$$

Tuhia te pūtakerua o ngā taha e rua o te whārite.

$$\sqrt{\left(x-\frac{3}{4}\right)^{2}}=\sqrt{-\frac{39}{16}}$$

Whakarūnātia.

$$x-\frac{3}{4}=\frac{\sqrt{39}i}{4} x-\frac{3}{4}=-\frac{\sqrt{39}i}{4}$$

Me tāpiri \frac{3}{4} ki ngā taha e rua o te whārite.

$$x=\frac{3+\sqrt{39}i}{4} x=\frac{-\sqrt{39}i+3}{4}$$