Whakaoti mō x
x=2
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Tohaina
Kua tāruatia ki te papatopenga
x^{2}+2x+1-\left(x-1\right)^{2}=8
Whakamahia te ture huarua \left(a+b\right)^{2}=a^{2}+2ab+b^{2} hei whakaroha \left(x+1\right)^{2}.
x^{2}+2x+1-\left(x^{2}-2x+1\right)=8
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(x-1\right)^{2}.
x^{2}+2x+1-x^{2}+2x-1=8
Hei kimi i te tauaro o x^{2}-2x+1, kimihia te tauaro o ia taurangi.
2x+1+2x-1=8
Pahekotia te x^{2} me -x^{2}, ka 0.
4x+1-1=8
Pahekotia te 2x me 2x, ka 4x.
4x=8
Tangohia te 1 i te 1, ka 0.
x=\frac{8}{4}
Whakawehea ngā taha e rua ki te 4.
x=2
Whakawehea te 8 ki te 4, kia riro ko 2.
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