You can
put this solution on YOUR website!
-9n3+6n2
-3n2(3n-2)
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Or, if you don't like having a negative sign sticking out front,
you can do it this way:
-9n3+6n2
Rewrite it as
6n2-9n3
3n2(2-3n)
Both answers are correct and equivalent.
Edwin