Answer:
x^2+y^2+12x+36
Explanation:
Expand the square
(x+6)^2+y^2
(x+6)(x+6)+y^2
Distribute
x(x+6)+6(x+6)+y^2
Distribute#2
x^2+6x+6(x+6)+y^2
x^2+6x+6x+36+y^2
Combine line terms
x^2+12x+36+y^2
Rearrange Terms
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