a^2-4ab+4b^2-2a+4b+1=0
(a-2b)^2-2(a-2b)+1=0
{(a-2b)-1}^2=0
a-2b=1
(a-2b)^2011=1
x^2+y^2-4x-10y+29=0
x^2-4x+4+y^2-10y+25=0
(x-2)^2+(y-5)^2=0
x=2 y=5
x^2y^2+2x^3y^2+x^4y^2
=x^2y^2(x^2+2x+1)
=x^2y^2(x+1)^2
=4x25x3^2
=900