Whakaoti mō x
x = \frac{145}{18} = 8\frac{1}{18} \approx 8.055555556
Graph
Tohaina
Kua tāruatia ki te papatopenga
x^{2}=81-18x+x^{2}+64
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(9-x\right)^{2}.
x^{2}=145-18x+x^{2}
Tāpirihia te 81 ki te 64, ka 145.
x^{2}+18x=145+x^{2}
Me tāpiri te 18x ki ngā taha e rua.
x^{2}+18x-x^{2}=145
Tangohia te x^{2} mai i ngā taha e rua.
18x=145
Pahekotia te x^{2} me -x^{2}, ka 0.
x=\frac{145}{18}
Whakawehea ngā taha e rua ki te 18.
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