1. (х-3)^2=2x(x-3)
x^2-6x+9=2x^2-6x
x^2-9=0
x^2=9
x=3 или x=-3
2. (x+3)^2+(x-3)^2=x(x+11)
x^2+6x+9+x^2-6x+9=x^2+11x
x^2-11x+18=0
D=11^2-18*4=121-72=49=7^2
x1=(11-7)\2=2
x2=(11+7)\2=9
3. (x+3)^2=6(x+5)+4
x^2+6x+9=6x+34
x^2-25=0
x^2=25
x=5 или x=-5
4. (x-3)^2=6(4-x)+1
x^2-6x+9=24-6x+1
x^2-16=0
x^2=16
x=4 или x=-4