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 Homework Statement

Question:A and B be 3×3 matrices such that AB+A+B=0 then which of the following holds:
(a)AB=BA (b)AB=BA (c)AB=1
 Homework Equations
 Matrix properties
I first tried by assuming the matrices but it was becoming complicated so i tried taking transpose on both sides,it also did not help.So now i could not think of what to do further.Help please.