x²+4x+4+y²-6y+9=0,,(y-3)²+(x+2)²=0∴y=3,x=-2
(1)(x+2)^2+9+y^2=6y(x+2)^2 +(y-3)^2 =0x=-2 and y=3x^2 = 4(2)m(m+2n)=4 (1)mn+n^2=-1 (2)(1) - 3(2)m^2-mn - 3n^2 =7