Aromātai
20n^{2}-2n-\frac{2}{5}
Whakaroha
20n^{2}-2n-\frac{2}{5}
Tohaina
Kua tāruatia ki te papatopenga
20n^{2}+5n\left(-\frac{4}{5}\right)+\frac{1}{2}\times 4n+\frac{1}{2}\left(-\frac{4}{5}\right)
Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o 5n+\frac{1}{2} ki ia tau o 4n-\frac{4}{5}.
20n^{2}-4n+\frac{1}{2}\times 4n+\frac{1}{2}\left(-\frac{4}{5}\right)
Me whakakore te 5 me te 5.
20n^{2}-4n+\frac{4}{2}n+\frac{1}{2}\left(-\frac{4}{5}\right)
Whakareatia te \frac{1}{2} ki te 4, ka \frac{4}{2}.
20n^{2}-4n+2n+\frac{1}{2}\left(-\frac{4}{5}\right)
Whakawehea te 4 ki te 2, kia riro ko 2.
20n^{2}-2n+\frac{1}{2}\left(-\frac{4}{5}\right)
Pahekotia te -4n me 2n, ka -2n.
20n^{2}-2n+\frac{1\left(-4\right)}{2\times 5}
Me whakarea te \frac{1}{2} ki te -\frac{4}{5} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.
20n^{2}-2n+\frac{-4}{10}
Mahia ngā whakarea i roto i te hautanga \frac{1\left(-4\right)}{2\times 5}.
20n^{2}-2n-\frac{2}{5}
Whakahekea te hautanga \frac{-4}{10} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.
20n^{2}+5n\left(-\frac{4}{5}\right)+\frac{1}{2}\times 4n+\frac{1}{2}\left(-\frac{4}{5}\right)
Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o 5n+\frac{1}{2} ki ia tau o 4n-\frac{4}{5}.
20n^{2}-4n+\frac{1}{2}\times 4n+\frac{1}{2}\left(-\frac{4}{5}\right)
Me whakakore te 5 me te 5.
20n^{2}-4n+\frac{4}{2}n+\frac{1}{2}\left(-\frac{4}{5}\right)
Whakareatia te \frac{1}{2} ki te 4, ka \frac{4}{2}.
20n^{2}-4n+2n+\frac{1}{2}\left(-\frac{4}{5}\right)
Whakawehea te 4 ki te 2, kia riro ko 2.
20n^{2}-2n+\frac{1}{2}\left(-\frac{4}{5}\right)
Pahekotia te -4n me 2n, ka -2n.
20n^{2}-2n+\frac{1\left(-4\right)}{2\times 5}
Me whakarea te \frac{1}{2} ki te -\frac{4}{5} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.
20n^{2}-2n+\frac{-4}{10}
Mahia ngā whakarea i roto i te hautanga \frac{1\left(-4\right)}{2\times 5}.
20n^{2}-2n-\frac{2}{5}
Whakahekea te hautanga \frac{-4}{10} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.
Ngā Tauira
whārite tapawhā
{ x } ^ { 2 } - 4 x - 5 = 0
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