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

(х-1)^2+(х+1)^2=(х+2)^2-2х+2
х^2-2x+1+х^2+2x+1=х^2+4х+4-2х+2
2х^2+2=х^2+2х+6
2х^2-х^2-2х+2-6=0
х^2-2х-4=0
a=1 b=-2 c=-4
D=b^2-4ac=(-2)^2-4*1*(-4)=4+16=20
x1= -b-D/2a= 2-20/2*1=2-4*5/2=2-25/2=2(1-5)/2=1-5
x2= -b+D/2a= 2+20/2*1=2+4*5/2=2+25/2=2(1+5)/2=1+5