The operation of subtracting two polynomials, like \((9x^2 + 17x + 13) - (2x^2 + 12x + 11)\), is a closed system under subtraction because the result of the subtraction is still a polynomial. Polynomials are closed under subtraction, meaning that subtracting one polynomial from another will always yield another polynomial.
In 1–2 sentences, explain why this operation is a closed system under subtraction.
(9x2+17x+13)−(2x2+12x+11)
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