Respuesta :
5x -6
-3x^3 + 2x^2 (Note how I changed the signs.)
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-3x^3 + 2x^2 + 5x - 6 (this is the "difference" that you wanted.
-3x^3 + 2x^2 (Note how I changed the signs.)
------------------------------------
-3x^3 + 2x^2 + 5x - 6 (this is the "difference" that you wanted.