x uchun yechish
x=5
Grafik
Baham ko'rish
Klipbordga nusxa olish
x^{2}=81-18x+x^{2}+9
\left(a-b\right)^{2}=a^{2}-2ab+b^{2} binom teoremasini \left(9-x\right)^{2} kengaytirilishi uchun ishlating.
x^{2}=90-18x+x^{2}
90 olish uchun 81 va 9'ni qo'shing.
x^{2}+18x=90+x^{2}
18x ni ikki tarafga qo’shing.
x^{2}+18x-x^{2}=90
Ikkala tarafdan x^{2} ni ayirish.
18x=90
0 ni olish uchun x^{2} va -x^{2} ni birlashtirish.
x=\frac{90}{18}
Ikki tarafini 18 ga bo‘ling.
x=5
5 ni olish uchun 90 ni 18 ga bo‘ling.
Misollar
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Chegaralar
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