作业帮化简：x^2 + 6x + 4y^2 + 8y + 4 = 0
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化简：x^2 + 6x + 4y^2 + 8y + 4 = 0
化简：x^2 + 6x + 4y^2 + 8y + 4 = 0
化简：x^2 + 6x + 4y^2 + 8y + 4 = 0
x^2 + 6x + 4y^2 + 8y + 4
=(x+3)^2-9+(2y+2)^2-4+4
=(x+3)^2+(2y+2)^2-9=0