Question

найдите корент уравнения (х-4)^2 + (х+9)^2=2х^2

Answer 1

x^2 - 8x + 16 + x^2 + 18x + 81 = 2x^2
2x^2 - 8x + 18x + 16 + 81 - 2x^2 = 0 
10x + 16 + 81 = 0 
10x + 97 = 0 
10x = - 97
x = - 9,7