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Whakaoti mō x
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x^{3}+4x^{2}-x-4=0
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
±4,±2,±1
Tā te Rational Root Theorem, ko ngā pūtake whakahau katoa o tētahi pūrau kei te āhua o \frac{p}{q}, ina wehea e p te kīanga pūmau -4, ā, ka wehea e q te whakarea arahanga 1. Whakarārangitia ngā kaitono katoa \frac{p}{q}.
x=1
Kimihia tētahi pūtake pērā mā te whakamātau i ngā uara tau tōpū katoa, e tīmata ana i te mea iti rawa mā te uara pū. Mēnā kāore he pūtake tau tōpū e kitea, whakamātauria ngā hautanga.
x^{2}+5x+4=0
Mā te whakatakotoranga Tauwehe, he tauwehe te x-k o te pūrau mō ia pūtake k. Whakawehea te x^{3}+4x^{2}-x-4 ki te x-1, kia riro ko x^{2}+5x+4. Whakaotihia te whārite ina ōrite te hua ki te 0.
x=\frac{-5±\sqrt{5^{2}-4\times 1\times 4}}{2}
Ka taea ngā whārite katoa o te momo ax^{2}+bx+c=0 te whakaoti mā te ture pūrua: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. Whakakapia te 1 mō te a, te 5 mō te b, me te 4 mō te c i te ture pūrua.
x=\frac{-5±3}{2}
Mahia ngā tātaitai.
x=-4 x=-1
Whakaotia te whārite x^{2}+5x+4=0 ina he tōrunga te ±, ina he tōraro te ±.
x=1 x=-4 x=-1
Rārangitia ngā otinga katoa i kitea.