Решите уравнения (7x-6)2-81=0 (6c-4)2-(4c+3)2=0 (x-3)2+(x+2)2=2(3-x)(x+2)

1) 14х-12-81=0;
14х=93;
х=93:14;
х=6 цел 9/14;

2) 12с-8-8с-6=0;
4с=14;
с=14:4;
с=3,5;

3) 2х-6+2х+4= 2(3х-х^2+6-2х);
4х-2=2(х-х^2+6); делим на 2;
х^2-х-6+2х-1=0;
х^2+х-7=0;
(х^2+2*1/2х+1/4)-1/4-7=0;
(х+1/2)^2=29/4;
х+1/2=+-(29^1/2)/2;
х1=-1/2-(29^1/2)/2;
х2=-1/2+(29^1/2)/2.