how do you factor x^2 +10x -9

My math teacher says this cannot be factored but I keep getting (x+9) (x -1) as the answer. What am  I doing wrong? I don't understand my math teacher.
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first do middle term split like this x^2-9x+1x-9 nd then take group wise common x(x-9)1(x-9) then its factorise (x+1)(x-9) hope u like it me prakash
by Level 1 User (180 points)

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