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...
if the integers are the same add if they are different subtract
Addition and subtraction are inverse functions.
When multiplying something with exponents, you add it. When dividing something with exponents, you subtract it.
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