The operation is a closed system under subtraction because the result of subtracting two polynomials, like (9x² + 17x + 13) and (2x² + 12x + 11), results in another polynomial, which is also within the same set of polynomials.

Question

Shorter and more simple

Answer 1

The operation is closed under subtraction because subtracting two polynomials, like (9x² + 17x + 13) and (2x² + 12x + 11), results in another polynomial.