Whakaoti mō a
a=-15
a=15
Tohaina
Kua tāruatia ki te papatopenga
a^{2}+400=25^{2}
Tātaihia te 20 mā te pū o 2, kia riro ko 400.
a^{2}+400=625
Tātaihia te 25 mā te pū o 2, kia riro ko 625.
a^{2}+400-625=0
Tangohia te 625 mai i ngā taha e rua.
a^{2}-225=0
Tangohia te 625 i te 400, ka -225.
\left(a-15\right)\left(a+15\right)=0
Whakaarohia te a^{2}-225. Tuhia anō te a^{2}-225 hei a^{2}-15^{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).
a=15 a=-15
Hei kimi otinga whārite, me whakaoti te a-15=0 me te a+15=0.
a^{2}+400=25^{2}
Tātaihia te 20 mā te pū o 2, kia riro ko 400.
a^{2}+400=625
Tātaihia te 25 mā te pū o 2, kia riro ko 625.
a^{2}=625-400
Tangohia te 400 mai i ngā taha e rua.
a^{2}=225
Tangohia te 400 i te 625, ka 225.
a=15 a=-15
Tuhia te pūtakerua o ngā taha e rua o te whārite.
a^{2}+400=25^{2}
Tātaihia te 20 mā te pū o 2, kia riro ko 400.
a^{2}+400=625
Tātaihia te 25 mā te pū o 2, kia riro ko 625.
a^{2}+400-625=0
Tangohia te 625 mai i ngā taha e rua.
a^{2}-225=0
Tangohia te 625 i te 400, ka -225.
a=\frac{0±\sqrt{0^{2}-4\left(-225\right)}}{2}
Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 1 mō a, 0 mō b, me -225 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
a=\frac{0±\sqrt{-4\left(-225\right)}}{2}
Pūrua 0.
a=\frac{0±\sqrt{900}}{2}
Whakareatia -4 ki te -225.
a=\frac{0±30}{2}
Tuhia te pūtakerua o te 900.
a=15
Nā, me whakaoti te whārite a=\frac{0±30}{2} ina he tāpiri te ±. Whakawehe 30 ki te 2.
a=-15
Nā, me whakaoti te whārite a=\frac{0±30}{2} ina he tango te ±. Whakawehe -30 ki te 2.
a=15 a=-15
Kua oti te whārite te whakatau.
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