Whakaoti i te 2x+3=17-x^2

$$2 x + 3 = 17 - x ^ { 2 }$$

Whakaoti mō x (complex solution)

$$x=\sqrt{15}-1\approx 2.872983346$$

$$x=-\left(\sqrt{15}+1\right)\approx -4.872983346$$

Ngā Upane e Whakamahi ana i te Tikanga Tātai Pūrua

Tangohia te 17 mai i ngā taha e rua.

$$2x+3-17=-x^{2}$$

Tangohia te 17 i te 3, ka -14.

$$2x-14=-x^{2}$$

Me tāpiri te x^{2} ki ngā taha e rua.

$$2x-14+x^{2}=0$$

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.

$$x^{2}+2x-14=0$$

Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 1 mō a, 2 mō b, me -14 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{-2±\sqrt{2^{2}-4\left(-14\right)}}{2}$$

Pūrua 2.

$$x=\frac{-2±\sqrt{4-4\left(-14\right)}}{2}$$

Whakareatia -4 ki te -14.

$$x=\frac{-2±\sqrt{4+56}}{2}$$

Tāpiri 4 ki te 56.

$$x=\frac{-2±\sqrt{60}}{2}$$

Tuhia te pūtakerua o te 60.

$$x=\frac{-2±2\sqrt{15}}{2}$$

Nā, me whakaoti te whārite x=\frac{-2±2\sqrt{15}}{2} ina he tāpiri te ±. Tāpiri -2 ki te 2\sqrt{15}.

$$x=\frac{2\sqrt{15}-2}{2}$$

Whakawehe -2+2\sqrt{15} ki te 2.

$$x=\sqrt{15}-1$$

Nā, me whakaoti te whārite x=\frac{-2±2\sqrt{15}}{2} ina he tango te ±. Tango 2\sqrt{15} mai i -2.

$$x=\frac{-2\sqrt{15}-2}{2}$$

Whakawehe -2-2\sqrt{15} ki te 2.

$$x=-\sqrt{15}-1$$

Kua oti te whārite te whakatau.

$$x=\sqrt{15}-1 x=-\sqrt{15}-1$$

Ngā Upane mō te Whakaoti i te Pūrua

Me tāpiri te x^{2} ki ngā taha e rua.

$$2x+3+x^{2}=17$$

Tangohia te 3 mai i ngā taha e rua.

$$2x+x^{2}=17-3$$

Tangohia te 3 i te 17, ka 14.

$$2x+x^{2}=14$$

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.

$$x^{2}+2x=14$$

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

$$x^{2}+2x+1^{2}=14+1^{2}$$

Pūrua 1.

$$x^{2}+2x+1=14+1$$

Tāpiri 14 ki te 1.

$$x^{2}+2x+1=15$$

Tauwehea x^{2}+2x+1. 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}.

$$\left(x+1\right)^{2}=15$$

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

$$\sqrt{\left(x+1\right)^{2}}=\sqrt{15}$$

Whakarūnātia.

$$x+1=\sqrt{15} x+1=-\sqrt{15}$$

Me tango 1 mai i ngā taha e rua o te whārite.

$$x=\sqrt{15}-1 x=-\sqrt{15}-1$$

Whakaoti mō x

$$x=\sqrt{15}-1\approx 2.872983346$$

$$x=-\sqrt{15}-1\approx -4.872983346$$

Ngā Upane e Whakamahi ana i te Tikanga Tātai Pūrua

Tangohia te 17 mai i ngā taha e rua.

$$2x+3-17=-x^{2}$$

Tangohia te 17 i te 3, ka -14.

$$2x-14=-x^{2}$$

Me tāpiri te x^{2} ki ngā taha e rua.

$$2x-14+x^{2}=0$$

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.

$$x^{2}+2x-14=0$$

Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 1 mō a, 2 mō b, me -14 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{-2±\sqrt{2^{2}-4\left(-14\right)}}{2}$$

Pūrua 2.

$$x=\frac{-2±\sqrt{4-4\left(-14\right)}}{2}$$

Whakareatia -4 ki te -14.

$$x=\frac{-2±\sqrt{4+56}}{2}$$

Tāpiri 4 ki te 56.

$$x=\frac{-2±\sqrt{60}}{2}$$

Tuhia te pūtakerua o te 60.

$$x=\frac{-2±2\sqrt{15}}{2}$$

Nā, me whakaoti te whārite x=\frac{-2±2\sqrt{15}}{2} ina he tāpiri te ±. Tāpiri -2 ki te 2\sqrt{15}.

$$x=\frac{2\sqrt{15}-2}{2}$$

Whakawehe -2+2\sqrt{15} ki te 2.

$$x=\sqrt{15}-1$$

Nā, me whakaoti te whārite x=\frac{-2±2\sqrt{15}}{2} ina he tango te ±. Tango 2\sqrt{15} mai i -2.

$$x=\frac{-2\sqrt{15}-2}{2}$$

Whakawehe -2-2\sqrt{15} ki te 2.

$$x=-\sqrt{15}-1$$

Kua oti te whārite te whakatau.

$$x=\sqrt{15}-1 x=-\sqrt{15}-1$$

Ngā Upane mō te Whakaoti i te Pūrua

Me tāpiri te x^{2} ki ngā taha e rua.

$$2x+3+x^{2}=17$$

Tangohia te 3 mai i ngā taha e rua.

$$2x+x^{2}=17-3$$

Tangohia te 3 i te 17, ka 14.

$$2x+x^{2}=14$$

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.

$$x^{2}+2x=14$$

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

$$x^{2}+2x+1^{2}=14+1^{2}$$

Pūrua 1.

$$x^{2}+2x+1=14+1$$

Tāpiri 14 ki te 1.

$$x^{2}+2x+1=15$$

Tauwehea x^{2}+2x+1. 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}.

$$\left(x+1\right)^{2}=15$$

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

$$\sqrt{\left(x+1\right)^{2}}=\sqrt{15}$$

Whakarūnātia.

$$x+1=\sqrt{15} x+1=-\sqrt{15}$$

Me tango 1 mai i ngā taha e rua o te whārite.

$$x=\sqrt{15}-1 x=-\sqrt{15}-1$$