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\left(x-20\right)\left(x+20\right)=0
Whakaarohia te x^{2}-400. Tuhia anō te x^{2}-400 hei x^{2}-20^{2}. Ka taea te rerekētanga o ngā pūrua te whakatauwehe mā te ture: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
x=20 x=-20
Hei kimi otinga whārite, me whakaoti te x-20=0 me te x+20=0.
x^{2}=400
Me tāpiri te 400 ki ngā taha e rua. Ko te tau i tāpiria he kore ka hua koia tonu.
x=20 x=-20
Tuhia te pūtakerua o ngā taha e rua o te whārite.
x^{2}-400=0
Ko ngā tikanga tātai pūrua pēnei i tēnei nā, me te kīanga tau x^{2} engari kāore he kīanga tau x, ka taea tonu te whakaoti mā te whakamahi i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}, ina tuhia ki te tānga ngahuru: ax^{2}+bx+c=0.
x=\frac{0±\sqrt{0^{2}-4\left(-400\right)}}{2}
Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 1 mō a, 0 mō b, me -400 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{0±\sqrt{-4\left(-400\right)}}{2}
Pūrua 0.
x=\frac{0±\sqrt{1600}}{2}
Whakareatia -4 ki te -400.
x=\frac{0±40}{2}
Tuhia te pūtakerua o te 1600.
x=20
Nā, me whakaoti te whārite x=\frac{0±40}{2} ina he tāpiri te ±. Whakawehe 40 ki te 2.
x=-20
Nā, me whakaoti te whārite x=\frac{0±40}{2} ina he tango te ±. Whakawehe -40 ki te 2.
x=20 x=-20
Kua oti te whārite te whakatau.