Question

Решите уравнение 2(х-2)(х+2)-(х-1)^2=х^2-5

Answer 1

2(х-2)(х+2)-(х-1)²=х²-5
2х²-8-х²+2х-1=х²-5
2х²-х²-х²+2х=-5+1+8
2х=4
х=2