Решите уравнение (x+9)^2+(x-11)^2=2x^2

Question

Решите уравнение (x+9)^2+(x-11)^2=2x^2

Answer 1

X^2 + 18x + 81 + (x^2 - 22x + 121) = 2x^2
2x^2 - 4x + 202 = 2x^2
2x^2 - 2x^2 - 4x + 202 = 0 
- 4x + 202 = 0
- 4x = - 202
x = 50,5 

Answer 2

X^2+2*x*9+9^2+x^2-2*x*11+11^2=2x^2
x^2+18x+81+x^2-22x+121-2x^2=0
-4x=-202
x=50,5