Решите уравнение x(x-4)=(x+3)^2

Question

Решите уравнение x(x-4)=(x+3)^2

Answer 1

x(x-4)=(x+3)^2 = 0
x^2 - 4x = x^2 + 6x + 9
x^2 - x^2 - 4x - 6x - 9 = 0
-10x - 9 = 0 | : 1
10x + 9 = 0
10x = -9
x = -9/10