Whakaoti i te x^2=x-30

$$x ^ { 2 } = x - 30$$

Whakaoti mō x (complex solution)

$$x=\frac{1+\sqrt{119}i}{2}\approx 0.5+5.454356057i$$

$$x=\frac{-\sqrt{119}i+1}{2}\approx 0.5-5.454356057i$$

Ngā Upane e Whakamahi ana i te Tikanga Tātai Pūrua

Tangohia te x mai i ngā taha e rua.

$$x^{2}-x=-30$$

Me tāpiri te 30 ki ngā taha e rua.

$$x^{2}-x+30=0$$

Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 1 mō a, -1 mō b, me 30 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{-\left(-1\right)±\sqrt{1-4\times 30}}{2}$$

Whakareatia -4 ki te 30.

$$x=\frac{-\left(-1\right)±\sqrt{1-120}}{2}$$

Tāpiri 1 ki te -120.

$$x=\frac{-\left(-1\right)±\sqrt{-119}}{2}$$

Tuhia te pūtakerua o te -119.

$$x=\frac{-\left(-1\right)±\sqrt{119}i}{2}$$

Ko te tauaro o -1 ko 1.

$$x=\frac{1±\sqrt{119}i}{2}$$

Nā, me whakaoti te whārite x=\frac{1±\sqrt{119}i}{2} ina he tāpiri te ±. Tāpiri 1 ki te i\sqrt{119}.

$$x=\frac{1+\sqrt{119}i}{2}$$

Nā, me whakaoti te whārite x=\frac{1±\sqrt{119}i}{2} ina he tango te ±. Tango i\sqrt{119} mai i 1.

$$x=\frac{-\sqrt{119}i+1}{2}$$

Kua oti te whārite te whakatau.

$$x=\frac{1+\sqrt{119}i}{2} x=\frac{-\sqrt{119}i+1}{2}$$

Ngā Upane mō te Whakaoti i te Pūrua

Tangohia te x mai i ngā taha e rua.

$$x^{2}-x=-30$$

Whakawehea te -1, te tau whakarea o te kīanga tau x, ki te 2 kia riro ai te -\frac{1}{2}. Nā, tāpiria te pūrua o te -\frac{1}{2} ki ngā taha e rua o te whārite. Mā konei e pūrua tika tonu ai te taha mauī o te whārite.

$$x^{2}-x+\left(-\frac{1}{2}\right)^{2}=-30+\left(-\frac{1}{2}\right)^{2}$$

Pūruatia -\frac{1}{2} mā te pūrua i te taurunga me te tauraro o te hautanga.

$$x^{2}-x+\frac{1}{4}=-30+\frac{1}{4}$$

Tāpiri -30 ki te \frac{1}{4}.

$$x^{2}-x+\frac{1}{4}=-\frac{119}{4}$$

Tauwehea x^{2}-x+\frac{1}{4}. 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}.

$$\left(x-\frac{1}{2}\right)^{2}=-\frac{119}{4}$$

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

$$\sqrt{\left(x-\frac{1}{2}\right)^{2}}=\sqrt{-\frac{119}{4}}$$

Whakarūnātia.

$$x-\frac{1}{2}=\frac{\sqrt{119}i}{2} x-\frac{1}{2}=-\frac{\sqrt{119}i}{2}$$

Me tāpiri \frac{1}{2} ki ngā taha e rua o te whārite.

$$x=\frac{1+\sqrt{119}i}{2} x=\frac{-\sqrt{119}i+1}{2}$$