Whakaoti mō x
x=-40
x=40
Graph
Tohaina
Kua tāruatia ki te papatopenga
5625+x^{2}=85^{2}
Tātaihia te 75 mā te pū o 2, kia riro ko 5625.
5625+x^{2}=7225
Tātaihia te 85 mā te pū o 2, kia riro ko 7225.
5625+x^{2}-7225=0
Tangohia te 7225 mai i ngā taha e rua.
-1600+x^{2}=0
Tangohia te 7225 i te 5625, ka -1600.
\left(x-40\right)\left(x+40\right)=0
Whakaarohia te -1600+x^{2}. Tuhia anō te -1600+x^{2} hei x^{2}-40^{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=40 x=-40
Hei kimi otinga whārite, me whakaoti te x-40=0 me te x+40=0.
5625+x^{2}=85^{2}
Tātaihia te 75 mā te pū o 2, kia riro ko 5625.
5625+x^{2}=7225
Tātaihia te 85 mā te pū o 2, kia riro ko 7225.
x^{2}=7225-5625
Tangohia te 5625 mai i ngā taha e rua.
x^{2}=1600
Tangohia te 5625 i te 7225, ka 1600.
x=40 x=-40
Tuhia te pūtakerua o ngā taha e rua o te whārite.
5625+x^{2}=85^{2}
Tātaihia te 75 mā te pū o 2, kia riro ko 5625.
5625+x^{2}=7225
Tātaihia te 85 mā te pū o 2, kia riro ko 7225.
5625+x^{2}-7225=0
Tangohia te 7225 mai i ngā taha e rua.
-1600+x^{2}=0
Tangohia te 7225 i te 5625, ka -1600.
x^{2}-1600=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(-1600\right)}}{2}
Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 1 mō a, 0 mō b, me -1600 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{0±\sqrt{-4\left(-1600\right)}}{2}
Pūrua 0.
x=\frac{0±\sqrt{6400}}{2}
Whakareatia -4 ki te -1600.
x=\frac{0±80}{2}
Tuhia te pūtakerua o te 6400.
x=40
Nā, me whakaoti te whārite x=\frac{0±80}{2} ina he tāpiri te ±. Whakawehe 80 ki te 2.
x=-40
Nā, me whakaoti te whārite x=\frac{0±80}{2} ina he tango te ±. Whakawehe -80 ki te 2.
x=40 x=-40
Kua oti te whārite te whakatau.
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