Whakaoti mō x
x\geq -2
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Tohaina
Kua tāruatia ki te papatopenga
4-x^{2}\geq -x^{2}-2x
Whakaarohia te \left(2-x\right)\left(2+x\right). Ka taea te whakareanga te panoni ki te rerekētanga o ngā pūrua mā te ture: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Pūrua 2.
4-x^{2}+x^{2}\geq -2x
Me tāpiri te x^{2} ki ngā taha e rua.
4\geq -2x
Pahekotia te -x^{2} me x^{2}, ka 0.
-2x\leq 4
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa. Ka huri tēnei i te aronga o te tohu.
x\geq \frac{4}{-2}
Whakawehea ngā taha e rua ki te -2. I te mea he tōraro a -2, ka huri te ahunga koreōrite.
x\geq -2
Whakawehea te 4 ki te -2, kia riro ko -2.
Ngā Tauira
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