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2x^{2}-7x-2-4x=5
Tangohia te 4x mai i ngā taha e rua.
2x^{2}-11x-2=5
Pahekotia te -7x me -4x, ka -11x.
2x^{2}-11x-2-5=0
Tangohia te 5 mai i ngā taha e rua.
2x^{2}-11x-7=0
Tangohia te 5 i te -2, ka -7.
x=\frac{-\left(-11\right)±\sqrt{\left(-11\right)^{2}-4\times 2\left(-7\right)}}{2\times 2}
Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 2 mō a, -11 mō b, me -7 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{-\left(-11\right)±\sqrt{121-4\times 2\left(-7\right)}}{2\times 2}
Pūrua -11.
x=\frac{-\left(-11\right)±\sqrt{121-8\left(-7\right)}}{2\times 2}
Whakareatia -4 ki te 2.
x=\frac{-\left(-11\right)±\sqrt{121+56}}{2\times 2}
Whakareatia -8 ki te -7.
x=\frac{-\left(-11\right)±\sqrt{177}}{2\times 2}
Tāpiri 121 ki te 56.
x=\frac{11±\sqrt{177}}{2\times 2}
Ko te tauaro o -11 ko 11.
x=\frac{11±\sqrt{177}}{4}
Whakareatia 2 ki te 2.
x=\frac{\sqrt{177}+11}{4}
Nā, me whakaoti te whārite x=\frac{11±\sqrt{177}}{4} ina he tāpiri te ±. Tāpiri 11 ki te \sqrt{177}.
x=\frac{11-\sqrt{177}}{4}
Nā, me whakaoti te whārite x=\frac{11±\sqrt{177}}{4} ina he tango te ±. Tango \sqrt{177} mai i 11.
x=\frac{\sqrt{177}+11}{4} x=\frac{11-\sqrt{177}}{4}
Kua oti te whārite te whakatau.
2x^{2}-7x-2-4x=5
Tangohia te 4x mai i ngā taha e rua.
2x^{2}-11x-2=5
Pahekotia te -7x me -4x, ka -11x.
2x^{2}-11x=5+2
Me tāpiri te 2 ki ngā taha e rua.
2x^{2}-11x=7
Tāpirihia te 5 ki te 2, ka 7.
\frac{2x^{2}-11x}{2}=\frac{7}{2}
Whakawehea ngā taha e rua ki te 2.
x^{2}-\frac{11}{2}x=\frac{7}{2}
Mā te whakawehe ki te 2 ka wetekia te whakareanga ki te 2.
x^{2}-\frac{11}{2}x+\left(-\frac{11}{4}\right)^{2}=\frac{7}{2}+\left(-\frac{11}{4}\right)^{2}
Whakawehea te -\frac{11}{2}, te tau whakarea o te kīanga tau x, ki te 2 kia riro ai te -\frac{11}{4}. Nā, tāpiria te pūrua o te -\frac{11}{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{11}{2}x+\frac{121}{16}=\frac{7}{2}+\frac{121}{16}
Pūruatia -\frac{11}{4} mā te pūrua i te taurunga me te tauraro o te hautanga.
x^{2}-\frac{11}{2}x+\frac{121}{16}=\frac{177}{16}
Tāpiri \frac{7}{2} ki te \frac{121}{16} mā te kimi i te tauraro pātahi me te tāpiri i ngā taurunga. Ka whakaiti i te hautanga ki ngā kīanga tau iti rawa e taea ana.
\left(x-\frac{11}{4}\right)^{2}=\frac{177}{16}
Tauwehea x^{2}-\frac{11}{2}x+\frac{121}{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}.
\sqrt{\left(x-\frac{11}{4}\right)^{2}}=\sqrt{\frac{177}{16}}
Tuhia te pūtakerua o ngā taha e rua o te whārite.
x-\frac{11}{4}=\frac{\sqrt{177}}{4} x-\frac{11}{4}=-\frac{\sqrt{177}}{4}
Whakarūnātia.
x=\frac{\sqrt{177}+11}{4} x=\frac{11-\sqrt{177}}{4}
Me tāpiri \frac{11}{4} ki ngā taha e rua o te whārite.