Question

решите уравнения
$x {}^{2} - (x - 4)(x + 4) = 2x$

Answer 1

x^2-(x-4)(x+4)=2x

x^2-(x^2+4x-4x-16)=2x

x^2-x^2-4x+4x+16=2x

16=2x

2x=16

x=8

Проверка: 64-4*12=16

16=16