Question

Решите уравнение:
(x+5)^2+(x-10)^2=2x^2

Answer 1

(x^2 + 10x + 25) + (x^2 - 20x + 100) = 2x^2
2x^2 - 10x + 125 = 2x^2
10x = 125
x = 12.5

Answer 2

ну откуда 10х и 20х???

Answer 3

(a +- b)^2 = a^2 +- 2ab + b^2