Whakaoti i te x^2+x-200=0

$${ x }^{ 2 } +x-200=0$$

Whakaoti mō x

$$x = \frac{3 \sqrt{89} - 1}{2} \approx 13.650971698$$

$$x=\frac{-3\sqrt{89}-1}{2}\approx -14.650971698$$

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.

$$x^{2}+x-200=0$$

Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 1 mō a, 1 mō b, me -200 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{-1±\sqrt{1^{2}-4\left(-200\right)}}{2}$$

Pūrua 1.

$$x=\frac{-1±\sqrt{1-4\left(-200\right)}}{2}$$

Whakareatia -4 ki te -200.

$$x=\frac{-1±\sqrt{1+800}}{2}$$

Tāpiri 1 ki te 800.

$$x=\frac{-1±\sqrt{801}}{2}$$

Tuhia te pūtakerua o te 801.

$$x=\frac{-1±3\sqrt{89}}{2}$$

Nā, me whakaoti te whārite x=\frac{-1±3\sqrt{89}}{2} ina he tāpiri te ±. Tāpiri -1 ki te 3\sqrt{89}.

$$x=\frac{3\sqrt{89}-1}{2}$$

Nā, me whakaoti te whārite x=\frac{-1±3\sqrt{89}}{2} ina he tango te ±. Tango 3\sqrt{89} mai i -1.

$$x=\frac{-3\sqrt{89}-1}{2}$$

Kua oti te whārite te whakatau.

$$x=\frac{3\sqrt{89}-1}{2} x=\frac{-3\sqrt{89}-1}{2}$$

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.

$$x^{2}+x-200=0$$

Me tāpiri 200 ki ngā taha e rua o te whārite.

$$x^{2}+x-200-\left(-200\right)=-\left(-200\right)$$

Mā te tango i te -200 i a ia ake anō ka toe ko te 0.

$$x^{2}+x=-\left(-200\right)$$

Tango -200 mai i 0.

$$x^{2}+x=200$$

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.

$$x^{2}+x+\left(\frac{1}{2}\right)^{2}=200+\left(\frac{1}{2}\right)^{2}$$

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

$$x^{2}+x+\frac{1}{4}=200+\frac{1}{4}$$

Tāpiri 200 ki te \frac{1}{4}.

$$x^{2}+x+\frac{1}{4}=\frac{801}{4}$$

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}.

$$\left(x+\frac{1}{2}\right)^{2}=\frac{801}{4}$$

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

$$\sqrt{\left(x+\frac{1}{2}\right)^{2}}=\sqrt{\frac{801}{4}}$$

Whakarūnātia.

$$x+\frac{1}{2}=\frac{3\sqrt{89}}{2} x+\frac{1}{2}=-\frac{3\sqrt{89}}{2}$$

Me tango \frac{1}{2} mai i ngā taha e rua o te whārite.

$$x=\frac{3\sqrt{89}-1}{2} x=\frac{-3\sqrt{89}-1}{2}$$