In 1–2 sentences, explain why the following operation is a closed system under subtraction.
(9x2+17x+13)−(2x2+12x+11)
(2 points)
The operation is a closed system under subtraction because when subtracting two polynomials, the result is also a polynomial.
The operation of subtraction is a closed system because when subtracting polynomials, the result is always another polynomial.
