Whakaoti mō x
x = \frac{9}{5} = 1\frac{4}{5} = 1.8
x=0
Graph
Tohaina
Kua tāruatia ki te papatopenga
10x^{2}-18x=0
Ko te tau i tāpiria he kore ka hua koia tonu.
x\left(10x-18\right)=0
Tauwehea te x.
x=0 x=\frac{9}{5}
Hei kimi otinga whārite, me whakaoti te x=0 me te 10x-18=0.
10x^{2}-18x=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(-18\right)±\sqrt{\left(-18\right)^{2}}}{2\times 10}
Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 10 mō a, -18 mō b, me 0 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{-\left(-18\right)±18}{2\times 10}
Tuhia te pūtakerua o te \left(-18\right)^{2}.
x=\frac{18±18}{2\times 10}
Ko te tauaro o -18 ko 18.
x=\frac{18±18}{20}
Whakareatia 2 ki te 10.
x=\frac{36}{20}
Nā, me whakaoti te whārite x=\frac{18±18}{20} ina he tāpiri te ±. Tāpiri 18 ki te 18.
x=\frac{9}{5}
Whakahekea te hautanga \frac{36}{20} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 4.
x=\frac{0}{20}
Nā, me whakaoti te whārite x=\frac{18±18}{20} ina he tango te ±. Tango 18 mai i 18.
x=0
Whakawehe 0 ki te 20.
x=\frac{9}{5} x=0
Kua oti te whārite te whakatau.
10x^{2}-18x=0
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.
\frac{10x^{2}-18x}{10}=\frac{0}{10}
Whakawehea ngā taha e rua ki te 10.
x^{2}+\left(-\frac{18}{10}\right)x=\frac{0}{10}
Mā te whakawehe ki te 10 ka wetekia te whakareanga ki te 10.
x^{2}-\frac{9}{5}x=\frac{0}{10}
Whakahekea te hautanga \frac{-18}{10} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.
x^{2}-\frac{9}{5}x=0
Whakawehe 0 ki te 10.
x^{2}-\frac{9}{5}x+\left(-\frac{9}{10}\right)^{2}=\left(-\frac{9}{10}\right)^{2}
Whakawehea te -\frac{9}{5}, te tau whakarea o te kīanga tau x, ki te 2 kia riro ai te -\frac{9}{10}. Nā, tāpiria te pūrua o te -\frac{9}{10} ki ngā taha e rua o te whārite. Mā konei e pūrua tika tonu ai te taha mauī o te whārite.
x^{2}-\frac{9}{5}x+\frac{81}{100}=\frac{81}{100}
Pūruatia -\frac{9}{10} mā te pūrua i te taurunga me te tauraro o te hautanga.
\left(x-\frac{9}{10}\right)^{2}=\frac{81}{100}
Tauwehea x^{2}-\frac{9}{5}x+\frac{81}{100}. 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}.
\sqrt{\left(x-\frac{9}{10}\right)^{2}}=\sqrt{\frac{81}{100}}
Tuhia te pūtakerua o ngā taha e rua o te whārite.
x-\frac{9}{10}=\frac{9}{10} x-\frac{9}{10}=-\frac{9}{10}
Whakarūnātia.
x=\frac{9}{5} x=0
Me tāpiri \frac{9}{10} ki ngā taha e rua o te whārite.
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