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Answer:
x^2+9x+18
Explanation:
x-y=0
x=y
in this case we have the roots which are the x values so:
x=-6
x+6=0
and
x=-3
x+3=0
(x+3)(x+6)=0
x^2+6x+3x+18=0
x^2+9x+18=0