Question

(5-2х)(5+2х)+4х(х-1)=17
Заранее спасибо

Answer 1

(5-2х)(5+2х) + 4х(х-1) = 17
5^2 - (2x)^2 + 4x^2 - 4x = 17
25 - 4x^2 + 4x^2 - 4x - 17 = 0
8 - 4x = 0
x = 2
Ответ : 2.