just add the negative of the polynomial, that is the same as subtracting it. For example, x^2+2x is a poly, the negative is -x^2-2x. So if we want to subtract x^2+2x from another poly, we can add the negative instead.
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The answer is -2m
adding its opposite?
Not always but they need to have the same denominators when adding or subtracting them.
Subtracting a negative integer is the same as adding its absolute value.
The denominators must be the same, the numerators can be different.